CN103868066A - Multi-stage combustion radiant tube heating device - Google Patents
Multi-stage combustion radiant tube heating device Download PDFInfo
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- CN103868066A CN103868066A CN201410105541.0A CN201410105541A CN103868066A CN 103868066 A CN103868066 A CN 103868066A CN 201410105541 A CN201410105541 A CN 201410105541A CN 103868066 A CN103868066 A CN 103868066A
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Abstract
The invention discloses a multi-stage combustion radiant tube heating device which comprises a radiant tube body, a main combustor and at least one grading device, wherein the radiant tube body is U-shaped, W-shaped or double P type. The main combustor is mounted at the burner end of the radiant tube body, fuel gas and combustion-supporting gas are led into the main combustor for primary combustion in a deviation chemical equivalence ratio, namely a first stage combustion zone, the at least one grading device is used for introducing fuel gas or combustion-supporting gas into the radiant tube body, the grading device is mounted inside the radiant tube body and gas flows to the connecting part of a straight pipe from a bent pipe, the flowing direction of supplied gas or fuel gas is the same with that of the gas inside the tube, and multi-stage combustion is realized. The grading device enables combustion inside the radiant tube to be graded, not only is the highest inflammation temperature inside the radiant tube be lowered and NOx production is reduced, but also the downstream gas temperature is increased. Therefore, entire temperature uniformity of the surface of the radiant tube is improved.
Description
Technical field
The invention belongs to gas fired radiant tubes technical field of heating; relate to a kind of gas-fired radiation pipe heating method and device that is applicable to heat-treat under protective atmosphere, object is to provide a kind of and adopts the gas subregion theory of combustion effectively to reduce NOx discharge and to promote wall surface temperature inhomogeneity new
multistage combustion radiation tube heater.
Background technology
Gas fired radiant tubes is that metal heat treatmet adds the mode of heating of hankering relatively commonly using, and has the advantages such as primary energy heat utilization efficiency is high, per surface area thermal power is large, operating cost is low.
For gas-fired radiation pipe heating device, due to burning very exothermic, flame temperature is higher, makes nitrogenous gas formation under aerobic conditions can produce the NOx of pollution, and mainly formation form has heating power type, Quick-type and fuel type etc.
For the conventional combustion gas of industry, conventionally nonnitrogenous, thereby gas fired radiant tubes is because ignition temperature is higher, its NOx principal mode is heating power type and part Quick-type.Thermal NO x reaction rate in the time of T>1500 ℃ is exponent increase, and Quick-type NOx is only in hydrocarbon fuels burning and fuel is excessive, ignition temperature just needs emphasis consideration when lower.Therefore the key that reduces gas fired radiant tubes NOx discharge is to reduce thermal NO x to generate.
Realize low NOx combustion technical measures and comprise high-temperature air burning, flue gas recirculation, Researched of Air Staging Combustion Burning Pulverized Coal, fuel combustion technology etc. again.Wherein fractional combustion, by control combustion district coefficient of excess air nonstoichiometry ratio, is realized multistage combustion; Fuel again combustion technology utilizes NOx reduction reaction principle to realize fuel-staged combustion, and these two kinds of methods are that application is the most general at present.
Mainly the burner of design with fractional combustion feature for the low NOx research of gas fired radiant tubes at present, one end that is distributed in radiant tube that this combustion system is comparatively concentrated high-temperature region, radiant tube wall surface temperature lack of homogeneity, and only, under the cooperation of meticulous control combustion air capacity, could reduce to a certain extent NOx generation and improve temperature distribution evenness.
Summary of the invention
in order to address the above problem, the object of this invention is to provide oneobject is by adopting subregion combustion technology, feed the combustion-supporting gas and the combustion gas that depart from stoichiometric ratio in main burner one end, form the burning of the firstth district, and arrange secondary combustion-supporting gas or secondary gas combustion apparatus at the other end or the multiterminal of radiant tube, feed the secondary combustion gas of secondary combustion-supporting gas, the burning of formation multi-region, reaches and reduces flame kernel temperature or form reducing atmosphere, and it is inhomogeneity that minimizing NOx generation promotes wall simultaneously
multistage combustion radiation tube heater.
Technical solution of the present invention is
a kind of multistage combustion radiation tube heater, this device comprisesradiant tube body, main burner and at least one grading plant,
Described radiant tube body is U-shaped, W type or double-P type radiant tube form;
Described main burner comprises fuel gas inlet and combustion-supporting gas entrance, and described main burner is arranged on the burner end of radiant tube body, and combustion gas and combustion-supporting gas are passed in main burner and after lighting, carry out one-level burning to depart from stoichiometric ratio, i.e. first-stage burning district,
Described at least one, grading plant is for combustion gas or combustion-supporting gas in radiant tube body, described grading plant is installed on gas in radiant tube body and flows to from bend pipe the junction of straight tube, and guarantee that the gas or the combustion gas that feed are consistent with gas flow direction in pipe, form multi-region burning.
Further, described main burner 3 comprises combustion gas 4 entrances and combustion-supporting gas 5 entrances, and the gas being fed by combustion-supporting gas entrance and fuel gas inlet departs from stoichiometric ratio.Being specially, while feeding the combustion-supporting gas 5 of whole combustion gas 4 and 50% ~ 90%, is fuel-rich combustion in primary combustion zone; When feeding 50% ~ 90% combustion gas 4 and all when combustion-supporting gas 5, being fuel-lean combustion in primary combustion zone;
Further, described secondary combustion-supporting gas or secondary combustion gas grading plant 7 can be arranged at multiple positions of radiant tube according to radiant tube shape difference, and the secondary combustion-supporting gas or the secondary combustion gas that remain 10% ~ 50% are caused in radiant tube, form multi-region burning;
Further, the combustion gas grading plant of described double-P type radiant tube is as Fig. 1, and combustion gas grading plant is installed on double-P type radiant tube afterbody gas and flows to from bend pipe the junction of straight tube, and secondary combustion-supporting gas sprays to gas flow direction in double-P type radiant tube.
Further, the combustion gas grading plant of described W type radiant tube is as Fig. 2, combustion gas grading plant, combustion gas grading plant and combustion gas grading plant are installed on gas in W type radiant tube and flow to from bend pipe the junction of straight tube, and secondary combustion-supporting gas, secondary combustion-supporting gas and secondary combustion-supporting gas blowout are to gas flow direction in W type radiant tube.
Further, the combustion gas grading plant of described U-shaped radiant tube is as Fig. 3, and combustion gas grading plant is installed on gas in U-shaped radiant tube and flows to from bend pipe the junction of straight tube, and secondary combustion-supporting gas sprays to gas flow direction in U-shaped radiant tube.
The present invention has the following advantages: the present invention, by adopting the subregion theory of combustion that the combustion-supporting gas of radiant tube or combustion gas are carried out to both-end or multiterminal classification, makes the burning of combustion gas subregion, but overall combustion-supporting gas amount guarantees that fuel can completing combustion.For the radiant tube of different casts, secondary combustion gas grading plant is installed on gas in radiant tube and flows to from bend pipe the junction of straight tube, secondary combustion-supporting gas or gas injection, to tube fluid flow direction, do not comprise that the interior gas of radiant tube is flowed to the junction of main burner place straight tube by bend pipe.First make whole combustion gas and one-level combustion-supporting gas carry out one-level burning at radiation pipe burner tip end (i.e. the firstth district), be now that fuel-rich combustion is due to oxygen quantity not sufficient, thereby can suppress the combination of nitrogen oxygen, reducing NOx generates, while feeding secondary combustion-supporting gas aftercombustion, the burning of formation Second Region, because flame temperature reduces, can not produce more NOx; Or whole combustion-supporting gases and one-level combustion gas are burnt at radiation pipe burner tip end (i.e. the firstth district), and be now fuel-lean combustion, oxygen amount is more sufficient, can produce more NOx, but while feeding secondary combustion gas by secondary combustion gas grading plant, can form compared with strongly reducing atmosphere reducing NOx at secondary conbustion zone.Because multi-region burning can also improve gas downstream temperature, thereby can promote the uniformity that body bulk temperature distributes.NOx discharge can be effectively controlled in these two kinds of subregion burnings, reduces the wall temperature difference.
Accompanying drawing explanation
Fig. 1 is that radiant tube heating means of the present invention and application of installation are in the structural representation of double-P type radiant tube.
Fig. 2 is that radiant tube heating means of the present invention and application of installation are in the structural representation of W type radiant tube.
Fig. 3 is that radiant tube heating means of the present invention and application of installation are in the structural representation of U-shaped radiant tube.
In figure: 1, radiant tube body, 2, furnace wall, 3, main burner, 4, combustion gas, 5, combustion-supporting gas, 6,6a, 6b, 6c all represent gas, 7,7a, 7b, 7c be grading plant, 8 is flue gas.
The specific embodiment
Below in conjunction with concrete the drawings and specific embodiments, technical scheme of the present invention is done further and illustrated.
Below in conjunction with accompanying drawing 1, double-P type radiant tube of the present invention is specifically practiced and laid down a definition.
If Fig. 1 is the structural representation that the present invention is applied to double-P type radiant tube, device comprises double-P type radiant tube body 1 part, main burner 3, grading plant 7, and entirety forms the double-P type radiant tube heater of high-temperature uniformity, low NOx drainage;
Combustion gas grading plant 7a, the 7b of double-P type radiant tube is installed on double-P type radiant tube central tube afterbody gas and flows to from bend pipe the junction of straight tube, and secondary combustion-supporting gas 6a, 6b spray to gas flow direction in double-P type radiant tube.
Now, secondary combustion-supporting gas or second gas burning staged combustion device 7a, 7b divide two parts to enter arm the secondary combustion-supporting gas or the secondary combustion gas that remain 10% ~ 50%, form respectively two the second combustion zones at two arms, can not only improve the temperature of gas in arm, reduce the wall temperature difference, can reduce flame kernel temperature or utilize second gas burning reducing NOx simultaneously;
For double-P type radiant tube, the flue gas of a part after Second Region burning recycle and enters central tube participation and burn after arm, and circulating flue gas has reduced the oxygen content of combustion centre, again reduces flame kernel temperature, reduce NOx and produce, another part flue gas is discharged through exhaust opening.
Below in conjunction with accompanying drawing 2, W type radiant tube of the present invention is specifically practiced and laid down a definition
If Fig. 2 is the structural representation that the present invention is applied to W type radiant tube, device comprises W type radiant tube body 1 part, main burner 3, grading plant 7a, 7b and 7c, and entirety forms the W type radiation tube heater of high-temperature uniformity, low NOx drainage;
Combustion gas grading plant 7a, the combustion gas grading plant 7b of W type radiant tube and combustion gas grading plant 7c are installed on gas in W type radiant tube and flow to from bend pipe the junction of straight tube, and secondary combustion gas body 6a, secondary combustion gas body 6b and secondary combustion-supporting gas 6c spray to gas flow direction in W type radiant tube.
When flue gas after the burning of the firstth district arrives W type radiant tube the first straight tube tail end, second gas burning body feeds secondary combustion gas 6a by grading plant 7a, and gas is burnt away at the second straight length, forms the second combustion zone;
When flue gas after the burning of Second Region arrives W type radiant tube the 3rd straight tube head end, three grades of combustion gas bodies feed secondary combustion gas 6b by grading plant 7b, and gas is burnt away at the 3rd straight length, form the 3rd combustion zone;
When flue gas after the burning of San district arrives W type radiant tube the 4th straight tube head end, level Four combustion-supporting gas feeds secondary combustion gas 6c by grading plant 7c, gas is burnt away at the 4th straight length, form the 4th combustion zone, the flue gas after burning is discharged from exhaust opening the most at last;
The layout of secondary combustion gas grading plant 7a, 7b, 7c makes W type radiant tube realize the form of multi-region burning, is not only burnt and is arranged the uniformity that has guaranteed radiant tube wall surface temperature by multi-region; Also utilize the way that reduces flame kernel temperature or two, three, the reduction of level Four gas reburning effectively to reduce NOx generation;
Below in conjunction with accompanying drawing 3, U-shaped radiant tube of the present invention is specifically practiced and laid down a definition.
If Fig. 3 is the structural representation that the present invention is applied to U-shaped radiant tube, device comprises U-shaped radiant tube body 1 part, main burner 3, grading plant 7, and entirety forms the U-shaped radiation tube heater of high-temperature uniformity, low NOx drainage;
Grading plant 7 is installed on gas in U-shaped radiant tube and flows to from bend pipe the junction of straight tube, and secondary combustion-supporting gas 6 sprays to gas flow direction in U-shaped radiant tube.
When flue gas after the burning of the firstth district arrives U-shaped radiant tube the first straight tube tail end, secondary combustion-supporting gas or secondary combustion gas grading plant 7 feed secondary combustion-supporting gas or the secondary combustion gas 6 of residue 10% ~ 50%, gas is burnt away at the second straight length, form the second combustion zone;
The layout of secondary combustion-supporting gas or second gas burning grading plant 7 makes U-shaped radiant tube realize the form of Liao Liang district burning, is not only arranged and has been guaranteed that the uniformity of radiant tube wall surface temperature has also effectively reduced NOx generation by the burning of twoth district;
The present invention is applied to subregion combustion technology in radiant tube, realize the burning of radiant tube multi-region, and be not only confined to existing burner fractional combustion, not only can the interior gas downstream of tub of tissue again burn, in guaranteeing efficiency of combustion, improve the uniformity that radiant tube distributes at axial temperature, can also effectively reduce NOx and generate and discharge.
Above-mentionedly just preferred embodiments more of the present invention are illustrated and described; but embodiments of the present invention are not restricted to the described embodiments; as long as the essentially identical means of one reach technique effect of the present invention, within all should belonging to protection scope of the present invention.
Claims (3)
1.
a kind of multistage combustion radiation tube heater, this device comprisesradiant tube body, main burner and at least one grading plant, is characterized in that,
Described radiant tube body is U-shaped, W type or double-P type radiant tube form;
Described main burner is arranged on the burner end of radiant tube body, and described main burner comprises fuel gas inlet and combustion-supporting gas entrance, and combustion gas and combustion-supporting gas are passed in main burner and after lighting, carry out one-level burning to depart from stoichiometric ratio, i.e. first-stage burning district,
Described at least one, grading plant is for combustion gas or combustion-supporting gas in radiant tube body, described grading plant is installed on gas in radiant tube body and flows to from bend pipe the junction of straight tube, and guarantee that the gas or the combustion gas that feed are consistent with gas flow direction in pipe, form multistage combustion district.
2. as claimed in claim 1
multistage combustion radiation tube heater, it is characterized in that, described main burner passes into 50% ~ 90% combustion-supporting gas and all combustion gas or 50% ~ 90% combustion gas and all combustion-supporting gases; Grading plant feeds residue combustion-supporting gas or combustion gas, and the total combustion-supporting gas or the combustion gas that make to feed radiant tube are normal infeed amount, finally form multi-region burning.
3. as claimed in claim 1
multistage combustion radiation tube heater, it is characterized in that, described combustion-supporting gas is air, oxygen enrichment, total oxygen gas or other combustion-supporting gases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410105541.0A CN103868066A (en) | 2014-03-20 | 2014-03-20 | Multi-stage combustion radiant tube heating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410105541.0A CN103868066A (en) | 2014-03-20 | 2014-03-20 | Multi-stage combustion radiant tube heating device |
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| CN103868066A true CN103868066A (en) | 2014-06-18 |
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| CN201410105541.0A Pending CN103868066A (en) | 2014-03-20 | 2014-03-20 | Multi-stage combustion radiant tube heating device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108496040A (en) * | 2016-03-15 | 2018-09-04 | 中外炉工业株式会社 | Radiant tube burner equipment |
| CN108700293A (en) * | 2016-07-04 | 2018-10-23 | 中外炉工业株式会社 | Industrial furnace |
| TWI686570B (en) * | 2016-03-15 | 2020-03-01 | 日商中外爐工業股份有限公司 | Industrial furnace |
| CN113864781A (en) * | 2021-09-30 | 2021-12-31 | 武汉钢铁有限公司 | Two-end type radiant tube staged combustion device and use method |
| CN114634819A (en) * | 2022-04-18 | 2022-06-17 | 中国科学院工程热物理研究所 | Heat exchange device and method for performing heat exchange regulation by using same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0293168A2 (en) * | 1987-05-26 | 1988-11-30 | Nippon Furnace Kogyo Kaisha Ltd. | Furnace with a radiant tube burner assembly including a two stage fuel supply |
| JPH05248605A (en) * | 1992-03-06 | 1993-09-24 | Sumitomo Metal Ind Ltd | Radiant tube type heater device and method of combustion in heater device |
| JP2002048334A (en) * | 2000-08-04 | 2002-02-15 | Nippon Furnace Kogyo Kaisha Ltd | Regenerative radiant-tube burner equipment of alternating combustion |
| CN101063525A (en) * | 2007-04-03 | 2007-10-31 | 北京科技大学 | Oxygen-enriched combustion radiant tube heaters |
-
2014
- 2014-03-20 CN CN201410105541.0A patent/CN103868066A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0293168A2 (en) * | 1987-05-26 | 1988-11-30 | Nippon Furnace Kogyo Kaisha Ltd. | Furnace with a radiant tube burner assembly including a two stage fuel supply |
| JPH05248605A (en) * | 1992-03-06 | 1993-09-24 | Sumitomo Metal Ind Ltd | Radiant tube type heater device and method of combustion in heater device |
| JP2002048334A (en) * | 2000-08-04 | 2002-02-15 | Nippon Furnace Kogyo Kaisha Ltd | Regenerative radiant-tube burner equipment of alternating combustion |
| CN101063525A (en) * | 2007-04-03 | 2007-10-31 | 北京科技大学 | Oxygen-enriched combustion radiant tube heaters |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108496040A (en) * | 2016-03-15 | 2018-09-04 | 中外炉工业株式会社 | Radiant tube burner equipment |
| TWI686569B (en) * | 2016-03-15 | 2020-03-01 | 日商中外爐工業股份有限公司 | Radiant tube burner equipment |
| TWI686570B (en) * | 2016-03-15 | 2020-03-01 | 日商中外爐工業股份有限公司 | Industrial furnace |
| CN108700293A (en) * | 2016-07-04 | 2018-10-23 | 中外炉工业株式会社 | Industrial furnace |
| CN108700293B (en) * | 2016-07-04 | 2020-05-22 | 中外炉工业株式会社 | Industrial furnace |
| CN113864781A (en) * | 2021-09-30 | 2021-12-31 | 武汉钢铁有限公司 | Two-end type radiant tube staged combustion device and use method |
| CN113864781B (en) * | 2021-09-30 | 2023-08-18 | 武汉钢铁有限公司 | Two-end radiant tube staged combustion device and use method thereof |
| CN114634819A (en) * | 2022-04-18 | 2022-06-17 | 中国科学院工程热物理研究所 | Heat exchange device and method for performing heat exchange regulation by using same |
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Application publication date: 20140618 |