CN113739197A - Low-nitrogen combustion method for radiant tube heating system - Google Patents
Low-nitrogen combustion method for radiant tube heating system Download PDFInfo
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- CN113739197A CN113739197A CN202111005387.6A CN202111005387A CN113739197A CN 113739197 A CN113739197 A CN 113739197A CN 202111005387 A CN202111005387 A CN 202111005387A CN 113739197 A CN113739197 A CN 113739197A
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- radiant tube
- oxygen concentration
- nox
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 title claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 19
- 238000009841 combustion method Methods 0.000 title claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 239000000779 smoke Substances 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 239000003546 flue gas Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 23
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 12
- 239000002912 waste gas Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
The invention relates to a low-nitrogen combustion method of a radiant tube heating system, which belongs to the technical field of low-nitrogen combustion. The invention utilizes partial combustion waste gas to enter the air pipeline system, thereby reducing the oxygen concentration of combustion air, reducing the combustion intensity and reducing the nitrogen oxide; the external smoke circulation is controlled by the NOx detection value in a linkage mode, the smoke external circulation is prevented from being unnecessarily increased, and energy waste is reduced. The invention can be widely applied to combustion systems with high heat value, small combustion space, high heat intensity and high control difficulty of nitrogen oxides.
Description
Technical Field
The invention belongs to the technical field of low-nitrogen combustion, and relates to a low-nitrogen combustion method of a radiant tube heating system.
Background
In the heat treatment process of the steel production flow, many links need to be carried out in special hearth atmosphere, and radiation tubes are needed to be adopted for indirect heating. In the indirect heating system of the radiant tube, the combustion space is severely limited and is relatively closed, the requirement on the combustion technology is extremely high, the conventional low-nitrogen combustion technologies such as internal flue gas circulation/air gas staged combustion and the like are difficult to adapt, and the nitrogen reduction effect is very unobvious; if the whole external furnace is adopted for removing the pin, the problems of high operation cost and the like exist.
In the prior art, a technical means that the external circulation of the flue gas is mixed with air and then participates in combustion supporting to realize low-nitrogen emission is usually adopted, but the external circulation of the flue gas is not controlled, and the technical problems of high exhaust gas temperature, large exhaust heat loss and the like of a system exist.
Disclosure of Invention
In view of the above, the present invention provides a low-nitrogen combustion method for a radiant tube heating system, which can realize the linkage control of ultra-low nitrogen oxides and flue gas circulation amount in the combustion process, realize the organic combination of pollutant emission index and energy efficiency, and has the advantages of simple structure, safe and reliable operation, and flexible control.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-nitrogen combustion method of a radiant tube heating system is characterized in that an air pipeline system and a smoke exhaust pipeline system are respectively connected to an air inlet end and an air outlet end of a radiant tube burner, the smoke exhaust pipeline system is connected to the air pipeline system in a return mode through a strip cut-off flow regulating valve, an NOx detection unit is arranged on the smoke exhaust pipeline system, an oxygen detection unit is arranged on the air pipeline system, an NOx emission target value is set, a combustion-supporting gas oxygen concentration set value is adjusted through an NOx detection value, and the opening degree of the strip cut-off flow regulating valve is adjusted through the oxygen detection value.
Optionally, during cold ignition, the flow regulating valve with cut-off is in a closed state; after ignition, opening the belt cut-off flow regulating valve, setting the initial combustion-supporting oxygen concentration set value as a1, and adjusting the opening of the belt cut-off flow regulating valve according to the detected oxygen value; and setting a NOx emission target value, and adjusting the current combustion-supporting oxygen concentration set value to be a2 according to the deviation of the NOx detection value and the NOx emission target value.
Optionally, a flame detection device is arranged on the radiant tube burner, and if abnormal closing of the burner or fire failure is detected, the current oxygen concentration set value a2 is adjusted upwards, and a2 is a1+ a'.
Optionally, the NOx emission target value is preset as b1, the NOx emission first fluctuation amount Δ b1 is preset, and when the relationship between the NOx emission target value b1 and the NOx detection value b0 satisfies: b0> (b 1-delta b1), the current set value of the oxygen concentration a2 is adjusted, a2 is a 1-a', the belt cut-off flow regulating valve is opened, the flue gas is introduced into the air pipeline, and the oxygen concentration in the combustion-supporting gas is reduced.
Optionally, the number of times of adjusting the combustion-supporting oxygen concentration set value according to the deviation between the NOx detection value and the NOx emission target value after ignition is one or more times.
Optionally, the NOx emission target value is preset as b1, the second NOx emission fluctuation amount Δ b2 is preset, and when the relationship between the NOx emission target value b1 and the NOx detection value b0 satisfies: and b0< (b 1-delta b2), adjusting the current oxygen concentration set value a2, wherein a2 is a1+ a', adjusting the oxygen concentration set value upwards, and reducing the smoke circulation volume.
Optionally, a' is 0.2%.
The invention has the beneficial effects that:
the invention has low technical requirements on the combustor, and can greatly reduce the investment cost of the combustor; the invention greatly reduces the temperature of combustion flame and can effectively prolong the service life of the burner and the radiant tube.
The invention controls the NOx emission, simultaneously accurately controls the external circulation amount of the flue gas, avoids unnecessary increase of the circulation amount of the flue gas, reduces the heat loss and improves the energy efficiency.
The technology of the invention has better application effect in various indirect heating systems of I-type/P-type/double-P-type/U-type/W-type radiant tubes and the like, and can also be applied to open flame heating systems which have high heat value, large combustion intensity and difficult control of nitrogen oxides in the combustion process, such as coke oven gas/natural gas/liquefied petroleum gas and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the system of the present invention.
Reference numerals: the system comprises an air pipeline system 1, a gas pipeline system 2, a radiant tube burner 3, a radiant tube 4, a smoke exhaust pipeline system 5, a smoke exhaust fan 6, a smoke circulating pipeline 7, a combustion fan 8, an oxygen detection unit 9, a pressure detection unit 10, a belt cut-off flow regulating valve 11, a flame detection unit 12 and an NOx detection unit 13.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a radiant tube heating system low-nitrogen combustion system includes a radiant tube burner 3, an air pipeline system 1 disposed at an air inlet thereof, a gas pipeline system 2, and a smoke exhaust pipeline system 5 disposed at an air outlet thereof; the smoke exhaust pipeline system 5 is connected with the air pipeline system 1 through a flow regulating valve 11 with a cut-off function; an oxygen NOx detection unit 13 is arranged on the air pipeline system 1, and an NOx detection unit 13 is arranged on the smoke exhaust pipeline system 5; a combustion fan 8 is arranged on the air pipeline; the connection point of the smoke exhaust pipeline and the air pipeline is positioned on the air inlet side of the combustion fan 8; the oxygen NOx detection unit 13 is arranged between the combustion fan 8 and the radiant tube burner 3; a pressure NOx detection unit 13 is also arranged between the combustion fan 8 and the radiant tube burner 3; a smoke exhaust fan 6 is arranged on the smoke exhaust pipeline system 5; the NOx detection unit 13 is arranged on the air outlet side of the smoke exhaust fan 6; a flame NOx detection unit 13 is arranged on the radiant tube burner 3; and the radiant tube burner 3 is connected with a radiant tube 4.
One embodiment of the system control method according to the present invention is as follows: when the cold furnace is ignited, the flue gas circulation pipeline 7 is in a closed state, pure air is adopted for combustion-supporting ignition, after the radiant tube burner 3 is ignited, the temperature drop of the system is gradually increased, and the flame state, the NOx emission index in the flue gas and the actual oxygen concentration in the air pipeline system 1 are continuously monitored in the process. Taking an emission index of 200mg @ 8% O2 as an emission control target value b1 of NOx, and when an actual measured value b0 of the NOx emitted by the flue gas is lower than the control target value, the flue gas circulation is always in a closed state, and the flue gas external circulation is not carried out; along with the increase of the system temperature, the emission index approaches a control target value b1, the difference value is smaller than delta b1(10mg), and when the difference value reaches 190mg @ 8% O2, a flue gas external circulation system is started, flue gas is introduced into the air pipeline system 1, the oxygen concentration in combustion-supporting gas is reduced, and the purpose of reducing the NOx emission index is achieved; meanwhile, the oxygen concentration in the combustion-supporting gas is accurately controlled, so that the external circulation quantity of the flue gas is accurately controlled, and the unnecessary increase of the exhaust gas temperature is avoided. After the temperature level of the system reaches the continuous production level, if the actual NOx emission value is still increased due to factors such as production rhythm change and the like, the system is adjusted according to the strategy; and if the actual NOx emission value falls back to a value which is less than the distance target value delta b2(30mg) and reaches 170mg @ 8% O2, reversely adjusting the set value of O2 in the combustion-supporting gas and reducing the external circulation amount of the flue gas.
Experimental data show that the oxygen concentration in the combustion-supporting gas is reduced, the NOx emission value is reduced, and the flue gas emission temperature is increased.
Adjusting the oxygen concentration control target in the combustion-supporting gas to adjust a' to be 0.2% on the basis of the previous state each time: the initial oxygen concentration of the system is 21%, the oxygen concentration in the combustion-supporting gas pipeline is set to be a 1-20.8%, and the initial oxygen concentration is used as a control target of the external circulation of the flue gas, and the emission value of NOx of the system is reduced to about 180mg @ 8% O2; the exhaust temperature will rise by about 4-7 ℃. The NOx emission index will continue to increase with further increase of the system temperature, when the NOx emission index approaches the control target again, the concentration set value of O2 in the combustion-supporting gas is reduced by 0.2 percent again to a 2-a 1-a' 20.8-0.2-20.6 percent, the external circulation amount of the flue gas is further increased, and the like until the system temperature reaches the continuous production level. In the temperature rise process, if the burner is flamed out very much, the oxygen concentration set value in the combustion-supporting gas is increased, the safe ignition of the burner is preferentially ensured, and when the temperature level of the system rises, the smoke circulation is increased again after the continuous and stable combustion can be ensured.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. A low-nitrogen combustion method of a radiant tube heating system is characterized in that: the air inlet end and the air outlet end of the radiant tube burner are respectively connected with an air pipeline system and a smoke exhaust pipeline system, the smoke exhaust pipeline system is connected to the air pipeline system in a return mode through a belt cut-off flow regulating valve, an NOx detection unit is arranged on the smoke exhaust pipeline system, an oxygen detection unit is arranged on the air pipeline system, an NOx emission target value is set, a combustion-supporting gas oxygen concentration set value is adjusted through an NOx detection value, and the opening degree of the belt cut-off flow regulating valve is adjusted through the oxygen detection value.
2. The radiant tube heating system low-nitrogen combustion method as claimed in claim 1, characterized in that: when the cold ignition is carried out, the flow regulating valve with the cut-off function is in a closed state; after ignition, opening the belt cut-off flow regulating valve, setting the initial combustion-supporting oxygen concentration set value as a1, and adjusting the opening of the belt cut-off flow regulating valve according to the detected oxygen value; and setting a NOx emission target value, and adjusting the current combustion-supporting oxygen concentration set value to be a2 according to the deviation of the NOx detection value and the NOx emission target value.
3. The radiant tube heating system low-nitrogen combustion method as claimed in claim 2, characterized in that: a flame detection device is arranged on the radiant tube burner, and if the burner is detected to be abnormally closed or not to be ignited, the current oxygen concentration set value a2 is adjusted upwards, wherein a2 is a1+ a'.
4. The radiant tube heating system low-nitrogen combustion method as claimed in claim 2, characterized in that: the preset NOx emission target value is b1, the first fluctuation quantity Delta b1 of the NOx emission is preset, and when the relation between the NOx emission target value b1 and the NOx detection value b0 meets the following conditions: b0> (b 1-delta b1), the current set value of the oxygen concentration a2 is adjusted, a2 is a 1-a', the belt cut-off flow regulating valve is opened, the flue gas is introduced into the air pipeline, and the oxygen concentration in the combustion-supporting gas is reduced.
5. The radiant tube heating system low-nitrogen combustion method as claimed in claim 2, characterized in that: and after ignition, adjusting the combustion-supporting oxygen concentration set value for one or more times according to the deviation between the NOx detection value and the NOx emission target value.
6. The radiant tube heating system low-nitrogen combustion method as claimed in claim 2, characterized in that: the preset NOx emission target value is b1, the second fluctuation quantity Delta b2 of the NOx emission is preset, and when the relation between the NOx emission target value b1 and the NOx detection value b0 meets the following conditions: and b0< (b 1-delta b2), adjusting the current oxygen concentration set value a2, wherein a2 is a1+ a', adjusting the oxygen concentration set value upwards, and reducing the smoke circulation volume.
7. The radiant tube heating system low-nitrogen combustion method as claimed in any one of claims 3, 4 and 6, characterized in that: and a' is 0.2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005387.6A CN113739197A (en) | 2021-08-30 | 2021-08-30 | Low-nitrogen combustion method for radiant tube heating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005387.6A CN113739197A (en) | 2021-08-30 | 2021-08-30 | Low-nitrogen combustion method for radiant tube heating system |
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| CN113739197A true CN113739197A (en) | 2021-12-03 |
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| CN202111005387.6A Pending CN113739197A (en) | 2021-08-30 | 2021-08-30 | Low-nitrogen combustion method for radiant tube heating system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207112780U (en) * | 2017-07-20 | 2018-03-16 | 中国中元国际工程有限公司 | A kind of gas-fired Boiler System and its flue gas recirculation nitrogen oxides emission reduction device |
| CN208901445U (en) * | 2018-08-08 | 2019-05-24 | 合肥顺昌余热利用科技有限公司 | A kind of smoke circulating device for gas burning pot stove |
| US20200191385A1 (en) * | 2017-09-05 | 2020-06-18 | John Zink Company, Llc | Low nox and co combustion burner method and apparatus |
| CN111394562A (en) * | 2020-03-27 | 2020-07-10 | 重庆赛迪热工环保工程技术有限公司 | Medium-low temperature heat treatment furnace |
-
2021
- 2021-08-30 CN CN202111005387.6A patent/CN113739197A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207112780U (en) * | 2017-07-20 | 2018-03-16 | 中国中元国际工程有限公司 | A kind of gas-fired Boiler System and its flue gas recirculation nitrogen oxides emission reduction device |
| US20200191385A1 (en) * | 2017-09-05 | 2020-06-18 | John Zink Company, Llc | Low nox and co combustion burner method and apparatus |
| CN208901445U (en) * | 2018-08-08 | 2019-05-24 | 合肥顺昌余热利用科技有限公司 | A kind of smoke circulating device for gas burning pot stove |
| CN111394562A (en) * | 2020-03-27 | 2020-07-10 | 重庆赛迪热工环保工程技术有限公司 | Medium-low temperature heat treatment furnace |
Non-Patent Citations (1)
| Title |
|---|
| 李军等: "《高等级公路机械化施工设备与技术》", 北京：人民交通出版社, pages: 202 * |
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