CN113864781A - Two-end type radiant tube staged combustion device and use method - Google Patents

Two-end type radiant tube staged combustion device and use method Download PDF

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Publication number
CN113864781A
CN113864781A CN202111160371.2A CN202111160371A CN113864781A CN 113864781 A CN113864781 A CN 113864781A CN 202111160371 A CN202111160371 A CN 202111160371A CN 113864781 A CN113864781 A CN 113864781A
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China
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air
radiant tube
pipe
tube
gas
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CN202111160371.2A
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CN113864781B (en
Inventor
宋中华
李�浩
王昌亮
丁翠娇
闫乃忠
杨超
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • 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
    • F23D14/12—Radiant burners
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/66—Preheating the combustion air or gas
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

The invention discloses a two-end type radiant tube staged combustion device and a using method thereof, and the device comprises a U-shaped radiant tube, wherein an air inlet hole is formed in the air end of the radiant tube, an air feeding tube is arranged outside the air inlet hole, a gas end of the radiant tube is provided with a gas tube hole, a heat exchanger and a fluid director are arranged in the air end of the radiant tube at intervals, the heat exchanger is communicated with the air inlet hole, a gas feeding tube is arranged on the gas tube hole, the partial end of the gas feeding tube extends into the radiant tube, an air distributor is sleeved at the outlet of the gas feeding tube, a smoke exhaust tube is arranged on the outer wall of the air end of the radiant tube, and an air connecting tube is arranged between the air end and the gas end of the radiant tube; and the air connecting pipe extends into the air end of the radiant tube and is connected with the heat exchanger. The invention adjusts all reaction zones toThe fuel-rich combustion can reduce the local high temperature of the flame zone and simultaneously generate a large amount of CO to reduce NOxGreatly reduce NOxThe amount of production.

Description

Two-end type radiant tube staged combustion device and use method
Technical Field
The invention relates to the field of metallurgical energy, in particular to a two-end type radiant tube staged combustion device and a using method thereof.
Background
The working mode of the radiant tube is as follows: the gas and a certain proportion of air are introduced into the burner to be sprayed and mixed for combustion, the high-temperature flue gas generated by combustion moves forward in the space in the radiant tube, and in the process, the high-temperature flue gas heats the radiant tube, the temperature of the flue gas gradually drops, and the flue gas exchanges heat with the air in the heat exchanger after reaching the tail part and is cooled, and then the flue gas is discharged into the atmosphere through a smoke exhaust pipeline and a smoke exhaust fan. Three conditions are generally satisfied:
one is that the combustion is to be sufficiently complete,
the second is that the combustion process cannot produce too much NOx,
thirdly, the temperature of the radiant tube needs to be uniform, and the requirement of uniformly heating the steel strip needs to be met.
To meet the three requirements, the most common tissue combustion method at present is air staged combustion. In the combustion mode, the gas is mixed with air with different proportions in stages in the advancing process to support combustion. Typically, first stage air (α < 1) and all fuel are fed into the radiant tubes for oxygen-deficient fuel-rich combustion, with the remainder being fed as second stage air downstream of the flame to complete the combustion of the fuel.
The current staged combustion is distributed by burner air distribution devices installed at the end of the radiant tube, and the use effect is limited by the burner air distribution structure. In the mode, once the air is sprayed out of the burner, the mixing of the air and the fuel gas is only influenced by the gas jet flow, at the moment, the burner cannot adjust and intervene the mixing process of the air and the fuel gas, the reaction of the air and the fuel gas must complete the tissue combustion in a jet flow control area, otherwise, once the air and the fuel gas are not completely combusted in the jet flow control area, the air and the fuel gas are combusted in an unorganized combustion mode, the fuel gas is discharged from the radiation pipe without being completely combusted, and the incomplete heat loss during combustion is increased.
In fact, the attenuation speed of the gas jet after being sprayed out of the nozzle is fast, the jet flow control area of air and fuel gas under the air classification structure of the single-end burner of the radiant tube is small, in order to ensure complete combustion, the air and fuel gas reaction area is usually finished at the 1/2-2/3 length of the radiant tube, the combustion intensity of the structure is still high, and the classification combustion is carried out on NOxThe effect of suppressing the amount of production is limited. In the area, air is mixed with fuel gas in stages to generate chemical reaction and release heat, when the flue gas generated after combustion enters the middle section and the rear section of the radiant tube far away from a combustor, the heat exchange process of the flue gas and the radiant tube is mainly performed, so that the temperature of the front half section of the radiant tube is greatly higher than that of the rear half section, the maximum temperature difference of the radiant tube can reach more than 150 ℃, and the heating uniformity of strip steel and the service life of the radiant tube are seriously influenced.
As can be seen from the above, the existing burner air hierarchical structure has smaller jet flow control area for air and fuel gas, and the staged combustion is used for NOxThe effect of suppressing the amount of production is limited. On the other hand, in the heat exchange process of the high-temperature flue gas and the radiant tube, the temperature of the flue gas is continuously reduced, and the temperature of the radiant tube is from high to low and is poor in uniformity.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a two-end type radiant tube staged combustion device and a using method thereofxThe formation volume is low, the high characteristics of temperature homogeneity, and it solves the problem that current radiant tube combustor exists mainly has:
(1) because the attenuation speed is fast after the gas jet is sprayed out, the jet control area of air and fuel gas under the air classification structure of the existing single-end burner of the radiant tube is small, and in order to ensure complete combustion, the air and fuel gas reaction area is usually finished at the 1/2-2/3 length of the radiant tube, and the structure is adoptedCombustion intensity is still larger, and fractional combustion is conducted on NOxThe effect of suppressing the amount of production is limited;
(2) when the flue gas generated after combustion enters the middle section and the rear section of the radiant tube far away from the combustor, the heat exchange process between the flue gas and the radiant tube is mainly performed, so that the temperature of the front half section of the radiant tube is greatly higher than that of the rear half section, the maximum temperature difference of the radiant tube can reach more than 150 ℃, and the heating uniformity of the strip steel and the service life of the radiant tube are seriously influenced.
In order to achieve the purpose, the invention designs a two-end type radiant tube staged combustion device which comprises a U-shaped radiant tube, wherein an air inlet hole is formed at the air end of the radiant tube, an air supply tube is arranged outside the air inlet hole,
the gas end of the radiant tube is provided with a gas tube hole, the air end of the radiant tube is internally provided with a heat exchanger and a fluid director in a separated manner, the heat exchanger is communicated with the air inlet hole, a flue gas channel is formed between the heat exchanger and the radiant tube, and an auxiliary combustion channel is formed between the fluid director and the radiant tube;
the gas pipe hole is provided with a gas supply pipe, part of the gas supply pipe extends into the radiant tube, and an outlet of the gas supply pipe is sleeved with an air distributor.
A smoke exhaust pipe is arranged on the outer wall of the air end of the radiant tube, and an air connecting pipe is arranged between the air end and the fuel gas end of the radiant tube; and the air connecting pipe extends into the air end of the radiant tube and is connected with the heat exchanger.
Furthermore, the heat exchanger comprises a shell, an air pipe is arranged at an air inlet end in the shell, an air outlet end of the shell is provided with an air spraying circular hole, and an air channel is formed between the air pipe and the shell; the air inlet and the air inlet hole intercommunication of air hose, the gas outlet of air hose is not connected with the end air blowout round hole of giving vent to anger of shell.
The two sections of air ejected from the air ejection circle are sent to a certain position of the radiant tube through the fluid director and then are subjected to secondary combustion with incomplete combustion reactants in the flue gas coming from the upstream of the radiant tube, and the generated heat improves the temperature of the rear section of the radiant tube, so that the integral temperature uniformity of the radiant tube is improved.
Furthermore, the distance between the air spraying circular hole and the fluid director is 0 mm-50 mm (the distance determines the amount of smoke sucked by the second section of air and the oxygen content participating in auxiliary combustion, the larger the distance is, the more smoke sucked by the second section of air before entering the fluid director is, the lower the oxygen content in the rear section of reaction zone is, and the NO can be effectively inhibitedxGeneration of (c).
Still further, the fluid director comprises a steel pipe with a hollow structure, and a plurality of circles of guide fins 4.2 are welded on the surface of the outer wall of the steel pipe at intervals.
Still further, the guide fin is a stainless steel plate, and the intersection angle alpha of the plane of the guide fin and the center line of the steel pipe is 20-50 degrees (the swirl flow type can well mix the secondary air and the upstream incomplete combustion reactant).
Still further, the intersection angle alpha of the plane of the guide fin and the center line of the steel pipe is 30 degrees.
The invention also provides a using method of the two-end type radiant tube staged combustion device, which comprises the following steps:
1) the total combustion air is introduced into an air pipe of the heat exchanger through an air supply pipe, and the air is divided into two sections of air when the air moves forward to the end of the heat exchanger under the driving of pressure;
2) one section of air enters an air channel formed between the air pipe and the shell, is preheated to a certain temperature by the shell of the heat exchanger, enters the other end of the radiant tube through the air connecting pipe, and is divided into 1-3 stages of air by the air distributor to be mixed and combusted with coal gas sprayed out through the coal gas feeding pipe in stages to generate smoke gas which flows to the downstream of the radiant tube;
3) the two-section air is ejected through the air ejection round hole and enters an auxiliary combustion channel in the fluid director, then the two-section air is ejected out and is sucked into the auxiliary combustion channel formed between the fluid director and the radiation tube by the suction force of the smoke exhaust tube together with an incompletely combusted reactant of an upstream incoming flow, and the completely combusted smoke enters a smoke channel formed between a shell of the heat exchanger and the radiation tube, exchanges heat with air flowing in the air channel and is exhausted into the atmosphere through the smoke exhaust tube.
The principle of the invention is as follows:
an air jet flow guide device is arranged at the tail end of the radiant tube, combustion air is divided into two sections of air which are respectively fed from two ends of the radiant tube, wherein one part of the air is fed from one end of the radiant tube with fuel gas supply in a grading manner and is mixed and combusted with the fuel gas, and the other part of the air is jetted from the end part of the heat exchanger and is jetted out through an air guide tube and then enters an interlayer of the air guide tube and the radiant tube together with an upstream incomplete combustion reactant to be mixed and combusted. In this way, all stages of combustion of the mixed gas and air in the first stage belong to oxygen-deficient combustion mode, so that the oxygen content in local high temperature and reaction zone can be reduced, and NO can be effectively inhibitedxAfter the flue gas is sucked by the two-stage air, the incomplete reactant coming from the upstream is subjected to afterburning, so that on one hand, the temperature of the rear section of the radiant tube is increased, and on the other hand, because the oxygen concentration of the two-stage air after the flue gas is sucked by the two-stage air is low, NO generated by the two-stage combustion is generatedxMinor, total NOxIt is greatly reduced.
The invention has the beneficial effects that:
(1) compared with the traditional staged combustion, the invention divides combustion-supporting air into first-stage air and second-stage air which are respectively supplied for supporting combustion from two ends of the radiant tube, the first-stage combustion adopts common staged combustion, the air is supplied in 2-3 stages, all reaction zones can be adjusted into fuel-rich type combustion due to insufficient oxygen in the first-stage combustion zone, the local high temperature of a flame zone can be reduced, and simultaneously, a large amount of CO is generated to reduce NOxCan greatly reduce NOxThe amount of production.
(2) According to the invention, incomplete reactants coming from the upstream are subjected to afterburning after smoke is sucked by the two sections of air fed from the other end of the radiant tube, so that on one hand, the temperature of the rear section of the radiant tube is increased, and the integral temperature uniformity of the radiant tube is improved, and on the other hand, because the oxygen concentration of the two sections of air after smoke is sucked by the entrainment is low, NO generated by two-section combustionxLess, resulting in total NOxIt is greatly reduced.
Drawings
FIG. 1 is a schematic structural view of a two-end radiant tube staged combustion device according to the present invention;
FIG. 2 is a gas flow diagram within the radiant tube of the present invention;
FIG. 3 is an enlarged view of I of FIG. 2;
FIG. 4 is an enlarged view II of FIG. 2;
FIG. 5 is an enlarged view of III of FIG. 2;
fig. 6 is a schematic structural view of the fluid director 2 in fig. 1.
In the figure, a radiant tube 1, an air inlet hole 1.1, a gas tube hole 1.2, an air supply tube 2, a heat exchanger 3, a shell 3.1, an air tube 3.2, an air ejection round hole 3.3, a fluid director 4, a steel tube 4.1, a flow guide fin 4.2, a coal gas supply tube 5, an air distributor 6, a smoke exhaust tube 7 and an air connecting tube 8.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
The two-end type radiant tube staged combustion device shown in fig. 1-6 comprises a U-shaped radiant tube 1, an air inlet hole 1.1 is arranged at the air end of the radiant tube 1, an air supply tube 2 is arranged outside the air inlet hole 1.1,
the gas end of the radiant tube 1 is provided with a gas tube hole 1.2, the air end of the radiant tube 1 is internally provided with a heat exchanger 3 and a fluid director 4 in a separating way,
the heat exchanger 3 comprises a shell 3.1, an air pipe 3.2 is arranged at an air inlet end in the shell 3.1, an air outlet end of the shell 3.1 is provided with an air outlet circular hole 3.3, and an air channel C is formed between the air pipe 3.2 and the shell 3.1; the air inlet of the air pipe 3.2 is communicated with the air inlet hole 1.1, and the air outlet of the air pipe 3.2 is not connected with the air outlet end air ejection round hole 3.3 of the shell 3.1;
the distance between the air spraying circular hole 3.3 and the fluid director 4 is 0 mm-50 mm; the fluid director 4 comprises a steel pipe 4.1 with a hollow structure, and a plurality of circles of guide fins 4.2 are welded on the outer wall surface of the steel pipe 4.1 at intervals;
the guide fin 4.2 is a stainless steel plate, the intersection angle alpha of the plane of the guide fin 4.2 and the central line of the steel pipe 4.1 is 30 degrees,
a flue gas channel A is formed between the heat exchanger 3 and the radiant tube 1, and an auxiliary combustion channel B is formed between the fluid director 4 and the radiant tube 1;
a gas supply pipe 5 is arranged on the gas pipe hole 1.2, part of the end of the gas supply pipe 5 extends into the radiant tube 1, an air distributor 6 is sleeved at the outlet of the gas supply pipe 5, a smoke exhaust pipe 7 is arranged on the outer wall of the air end of the radiant tube 1, and an air connecting pipe 8 is arranged between the air end and the gas end of the radiant tube 1; and the air connecting pipe 8 extends into the air end of the radiant tube 1 and is connected with the heat exchanger 3.
The use method of the two-end type radiant tube staged combustion device comprises the following steps:
1) the total combustion air is introduced into an air pipe of the heat exchanger 3 through the air supply pipe 2, and is divided into two sections of air when the air moves forward to the end of the heat exchanger 3 under the driving of pressure;
2) one section of air enters an air channel C formed between the air pipe and the shell, is preheated to a certain temperature by the shell of the heat exchanger 3, enters the other end of the radiant tube 1 through an air connecting pipe 8, is divided into 1-3 stages of air by an air distributor 6, and is mixed and combusted with coal gas sprayed out by a coal gas feeding pipe 5 to generate smoke gas which flows to the downstream of the radiant tube 1;
3) after being ejected into an auxiliary combustion channel B in a fluid director 4 through an air ejection circular hole 3.3, the secondary air is ejected out and is sucked into the auxiliary combustion channel B formed between the fluid director 4 and a radiation tube 1 by the suction force of a smoke exhaust tube 7 together with an incomplete combustion reactant of upstream incoming flow for combustion, and the completely combusted smoke enters a smoke channel A formed between a shell of a heat exchanger 3 and the radiation tube 1 to exchange heat with air flowing in an air channel C and is exhausted into the atmosphere through the smoke exhaust tube 7.
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.

Claims (7)

1. The utility model provides a hierarchical burner of both ends formula radiant tube which characterized in that: it comprises a U-shaped radiant tube (1), an air inlet hole (1.1) is arranged at the air end of the radiant tube (1), an air supply tube (2) is arranged outside the air inlet hole (1.1),
a gas pipe hole (1.2) is formed in the gas end of the radiant pipe (1), a heat exchanger (3) and a fluid director (4) are arranged in the air end of the radiant pipe (1) in a separated mode, the heat exchanger (3) is communicated with the air inlet hole (1.1), a flue gas channel is formed between the heat exchanger (3) and the radiant pipe (1), and an auxiliary combustion channel is formed between the fluid director (4) and the radiant pipe (1);
a coal gas feeding pipe (5) is installed on the gas pipe hole (1.2), part of the end of the coal gas feeding pipe (5) extends into the radiant tube (1), and an air distributor (6) is sleeved at an outlet of the coal gas feeding pipe (5);
a smoke exhaust pipe (7) is mounted on the outer wall of the air end of the radiant tube (1), and an air connecting pipe (8) is arranged between the air end and the gas end of the radiant tube (1); and the air connecting pipe (8) extends into the air end of the radiant tube (1) and is connected with the heat exchanger (3).
2. The two-end radiant tube staged combustion device of claim 1, wherein: the heat exchanger (3) comprises a shell (3.1), an air pipe (3.2) is arranged at an air inlet end in the shell (3.1), an air outlet end of the shell (3.1) is provided with an air spraying round hole (3.3), and an air channel is formed between the air pipe (3.2) and the shell (3.1); the air inlet and the air inlet hole (1.1) intercommunication of air hose (3.2), the gas outlet of air hose (3.2) is not connected with the end air blowout round hole (3.3) of giving vent to anger of shell (3.1).
3. The two-end radiant tube staged combustion device of claim 1, wherein: the distance between the air spraying circular hole (3.3) and the fluid director (4) is 0 mm-50 mm.
4. The two-end radiant tube staged combustion device of claim 1, wherein: the flow guider (4) comprises a steel pipe (4.1) with a hollow structure, and a plurality of circles of flow guiding fins (4.2) are welded on the surface of the outer wall of the steel pipe (4.1) at intervals.
5. The two-end radiant tube staged combustion device of claim 4, wherein: the guide fins (4.2) are stainless steel plates, and the intersection angle alpha of the plane of each guide fin (4.2) and the center line of the steel pipe (4.1) is 20-50 degrees.
6. The two-end radiant tube staged combustion device of claim 5, wherein: the intersection angle alpha of the plane of the guide fin (4.2) and the center line of the steel pipe (4.1) is 30 degrees.
7. The use method of the two-end type radiant tube staged combustion device is characterized in that: the method comprises the following steps:
1) the total combustion air is introduced into an air pipe of the heat exchanger (3) through an air supply pipe (2), and is divided into two sections of air when the air moves forward to the end of the heat exchanger (3) under the driving of pressure;
2) one section of air enters an air channel formed between an air pipe and a shell, is preheated to a certain temperature by the shell of the heat exchanger (3), enters the other end of the radiant tube (1) through an air connecting pipe (8), and is divided into 1-3 stages of air through an air distributor (6) to be mixed and combusted with coal gas sprayed out through a coal gas feeding pipe (5) to generate smoke gas to flow to the downstream of the radiant tube (1);
3) the secondary air is ejected through the air ejection round hole (3.3) and enters an auxiliary combustion channel in the fluid director (4), then is ejected out and is sucked into the auxiliary combustion channel formed between the fluid director (4) and the radiation tube (1) by the suction force of the exhaust pipe (7) together with the incompletely combusted reactant of the upstream incoming flow for combustion, and the completely combusted flue gas enters a flue gas channel formed between the shell of the heat exchanger (3) and the radiation tube (1) to exchange heat with the air flowing in the air channel and then is exhausted into the atmosphere through the exhaust pipe (7).
CN202111160371.2A 2021-09-30 2021-09-30 Two-end radiant tube staged combustion device and use method thereof Active CN113864781B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114992639A (en) * 2022-07-01 2022-09-02 北京兴达奇热工控制设备有限公司 Air-gas heat exchanger for radiant tube

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Publication number Priority date Publication date Assignee Title
JPH062819A (en) * 1992-06-16 1994-01-11 Paloma Ind Ltd Low-nox burner
JPH0665705U (en) * 1993-02-25 1994-09-16 中外炉工業株式会社 Thermal storage radiant tube system
JPH07119958A (en) * 1993-10-21 1995-05-12 Nkk Corp Heat accumulation burner
EP0778442A2 (en) * 1995-12-06 1997-06-11 Schott Glaswerke Radiant gas burner with burner plate of fibre material and reduced noise generation
CN103868066A (en) * 2014-03-20 2014-06-18 北京科技大学 Multi-stage combustion radiant tube heating device
WO2018168160A1 (en) * 2017-03-13 2018-09-20 大陽日酸株式会社 Method and device for heating to-be-heated object

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH062819A (en) * 1992-06-16 1994-01-11 Paloma Ind Ltd Low-nox burner
JPH0665705U (en) * 1993-02-25 1994-09-16 中外炉工業株式会社 Thermal storage radiant tube system
JPH07119958A (en) * 1993-10-21 1995-05-12 Nkk Corp Heat accumulation burner
EP0778442A2 (en) * 1995-12-06 1997-06-11 Schott Glaswerke Radiant gas burner with burner plate of fibre material and reduced noise generation
CN103868066A (en) * 2014-03-20 2014-06-18 北京科技大学 Multi-stage combustion radiant tube heating device
WO2018168160A1 (en) * 2017-03-13 2018-09-20 大陽日酸株式会社 Method and device for heating to-be-heated object
CN110392805A (en) * 2017-03-13 2019-10-29 大阳日酸株式会社 The heating means and heating device of heating object

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114992639A (en) * 2022-07-01 2022-09-02 北京兴达奇热工控制设备有限公司 Air-gas heat exchanger for radiant tube

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