CN109099721A - Reduce the heating furnace heating system and method for discharged nitrous oxides - Google Patents
Reduce the heating furnace heating system and method for discharged nitrous oxides Download PDFInfo
- Publication number
- CN109099721A CN109099721A CN201811155065.8A CN201811155065A CN109099721A CN 109099721 A CN109099721 A CN 109099721A CN 201811155065 A CN201811155065 A CN 201811155065A CN 109099721 A CN109099721 A CN 109099721A
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- Prior art keywords
- flue gas
- combustion air
- heating furnace
- burner
- pipeline
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Classifications
-
- 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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
-
- 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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- 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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
- F27D2099/0053—Burner fed with preheated gases
- F27D2099/0056—Oxidant
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The present invention relates to the heating furnace heating systems and method that reduce discharged nitrous oxides, flat flame burner that is at the top of heating furnace and being suitable for burning under low-oxygen environment is located at including several, several are located at heating furnace side and energy flameless combustion flameless gas burner, combustion fan, circulating fan, flue gas-combustion air heat exchanger and distribution pipe, combustion fan entrance is connected to combustion air source, outlet is connected with combustion air pipeline, combustion air pipeline is connected to distribution pipe after flue gas-combustion air heat exchanger, distribution pipe passes through flat flame burner piping connection to flat flame burner, pass through flameless gas burner piping connection to flameless gas burner, the exhanst gas outlet of heating furnace is connected with flue gas pipeline, flue gas pipeline is divided into two-way after flue gas-combustion air heat exchanger, chimney is connected to by discharge pipe all the way, another way is connected to circulation by circulation line Fans entrance, circulating fan outlet access flat flame burner pipeline by access pipeline.The present invention is able to achieve the ultralow NO of high-temperature heatingXDischarge.
Description
Technical field
The invention belongs to industrial gasses pollutant emission control fields, and in particular to a kind of to reduce adding for discharged nitrous oxides
Hot stove heating system and method.
Background technique
Nitrogen oxides (NOx) is to cause one of primary pollution source for the source of atmospheric pollution, can be to human body, animal or plant
Object causes intoxicating and detrimental effect, while being also one of acid rain, acid mist and main reason of photochemical fog, studies and administers
NOx emission is also a Main way in international pollution control field.
Currently, billet heating furnace application furnace temperature belongs to high-temperature heating stove, is simultaneously usually between 1100-1350 DEG C
Reach energy-efficient purpose, air and gas preheater be set usually on flue to preheat to combustion air and coal gas,
Preheating of air temperature is usually between 450 DEG C -550 DEG C, and gas preheating temperature is usually between 250 DEG C -300 DEG C, " high furnace temperature
+ high preheating temperature " greatly accelerates NOxThe generation of discharge, NOx emission are easily exceeded.
In order to which NO is effectively reducedxDischarge, heating furnace heating system are usually selected " long-flame burners+flat flame burner " or " are adjusted
Flame burner nozzle+flat flame burner " configuration mode ", two ways is to elongate burner by way of air, the coal gas fractional combustion
Flame, and then the generation of local high temperature zone is reduced, to reduce NOxDischarge index, can be by NO by the method for fractional combustionx
Discharge index is reduced to 200mg/Nm3Left and right, but expect that lower discharge index seems very difficult.
In recent years, country is for NOxThe requirement of discharge index is increasingly stringenter, many areas by discharge index adjust to
150mg/Nm3, some areas even require discharge index control in 100mg/Nm3Hereinafter, realizing extremely low NO for heating furnacexRow
The demand put is more more and more urgent.
Summary of the invention
The object of the present invention is to provide a kind of heating furnace heating system and method for reducing discharged nitrous oxides, energy of the present invention
Heating furnace NOx emission is enough greatly reduced, realizes the ultralow NO of high-temperature heatingxFire box temperature distribution is greatly improved in discharge
Uniformity improves control of industrial furnace home.
The technical scheme adopted by the invention is that:
A kind of heating furnace heating system reducing discharged nitrous oxides, is located at the top of heating furnace and is suitable for including several
The flat flame burner that burns under low-oxygen environment, several be located at heating furnace side and can flameless combustion flameless gas burner, combustion air
Machine, circulating fan, flue gas-combustion air heat exchanger and distribution pipe, combustion fan entrance are connected to combustion air source, outlet connection
There is combustion-supporting air pipe line, combustion air pipeline is connected to distribution pipe after flue gas-combustion air heat exchanger, and distribution pipe passes through flat
To flat flame burner, by flameless gas burner piping connection to flameless gas burner, the exhanst gas outlet of heating furnace connects flame burner nozzle piping connection
There is flue gas pipeline, flue gas pipeline is divided into two-way after flue gas-combustion air heat exchanger, is connected to cigarette by discharge pipe all the way
Chimney, another way are connected to circulating fan entrance by circulation line, and circulating fan outlet accesses flat flame burner by access pipeline
Pipeline.
Further, the sky for accurately being adjusted to flow is equipped on flat flame burner pipeline and flameless gas burner pipeline
Air-flow adjustable valve and air mass flow orifice plate.
Further, circulation line is equipped with the flue gas stream for being accurately controlled to the exhaust gas volumn that circulating fan sucks
Adjustable valve and flue gas flow orifice plate.
Further, the oxygen that flat flame burner pipeline is equipped with for detecting oxygen content in the combustion air by flue gas dilution contains
Amount detection machine structure.
A kind of heating furnace heating means reducing discharged nitrous oxides are used at the top of heating furnace and are fired under being suitable for low-oxygen environment
The flat flame burner of burning is heated, is heated in heating furnace side using the flameless gas burner of energy flameless combustion, and heating furnace is recycled
Burn the flue gas generated, then flue gas and combustion air are exchanged heat by flue gas-combustion air heat exchanger, the combustion air after heat exchange
Flat flame burner and flameless gas burner are each led into, flue gas a part after heat exchange is by chimney discharge, another part and is passed through flat flame
The combustion air of burner mixes.
The beneficial effects of the present invention are:
Heating furnace NOx emission can be greatly reduced in the present invention, realize the ultralow NO of high-temperature heatingxDischarge-flat flame burner energy
Guarantee to be stablized with combustion gas by the combustion air of flue gas dilution and burn and form open and flat flame, since the oxygen in combustion air contains
Amount is greatly reduced, and local high temperature zone caused by flat flame burner burning is reduced, and burner NOx generation amount accordingly reduces, in turn
Bring entire top heating region entirety NOxDischarge is greatly reduced；After combustion air is by combustion fan and heat exchanger preheating, directly
It picks into flameless gas burner, is burnt under normal heating technique by flameless combustion technology, flameless gas burner switches to nonflame state
When lower work, burner flame disappears, and NOx emission is greatly reduced, and highest NOx emission value can reduce by 90%, and then bring entire side
Portion heating region entirety NOxDischarge is greatly reduced.
The present invention passes through the use of " flameless combustion+circulating flue gas flat flame " technology, significantly reduces the part in heating furnace
High-temperature region improves control of industrial furnace home so that the uniformity of fire box temperature distribution be greatly improved.
The present invention passes through the use of " circulating flue gas flat flame " technology, can guarantee to be formed under hypoxic condition and stablize burning
Flat flame reduces the NO of flat flame burner while guaranteeing heating processxDischarge.
Detailed description of the invention
Fig. 1 is the schematic diagram that the heating furnace heating system of discharged nitrous oxides is reduced in the embodiment of the present invention.
In figure: 1- flat flame burner；2- flameless gas burner；3- combustion fan；4- circulating fan；5- flue gas flow regulating valve；6-
Flue gas flow orifice plate；7- air flow rate adjustment valve；8- air mass flow orifice plate；9- oxygen content testing agency；10- distribution pipe.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of heating furnace heating system for reducing discharged nitrous oxides, including several are located at heating furnace roof
Portion and be suitable for low-oxygen environment under burn flat flame burner 1, several be located at heating furnace side and can flameless combustion nonflame
Burner 2, combustion fan 3, circulating fan 4, flue gas-combustion air heat exchanger and distribution pipe 10,3 entrance of combustion fan, which is connected to, to be helped
Combustion air-source, outlet are connected with combustion air pipeline, and combustion air pipeline is connected to point after flue gas-combustion air heat exchanger
Piping 10, to flat flame burner, (flat flame burner 1 can be with flat flame burner pipeline one by one by flat flame burner piping connection for distribution pipe 10
Corresponding, several flat flame burners 1 that can also be adjacent are one group, and one or more groups of flat flame burners 1 share a flat flame burner pipe
Road), to flameless gas burner 2, (flameless gas burner 2 can be corresponded with flameless gas burner pipeline, can also by flameless gas burner piping connection
With adjacent several flameless gas burners 2 for one group, one or more groups of flameless gas burners 2 share a flameless gas burner pipeline), heating furnace
Exhanst gas outlet is connected with flue gas pipeline, and flue gas pipeline is divided into two-way after flue gas-combustion air heat exchanger, passes through discharge all the way
Piping connection is connected to 4 entrance of circulating fan by circulation line to chimney, another way, and the outlet of circulating fan 4 passes through access tube
Flat flame burner pipeline is accessed on road.
The principle of the present invention is: heated at the top of heating furnace using the flat flame burner 1 to burn under being suitable for low-oxygen environment,
Heating furnace side using can the flameless gas burner 2 of flameless combustion heated, the flue gas that recycling heating furnace burning generates, then by cigarette
By flue gas-combustion air heat exchanger heat exchange, the combustion air after heat exchange each leads into flat flame burner 1 and nothing for gas and combustion air
Flame burner nozzle 2, flue gas a part after heat exchange are mixed by chimney discharge, another part with the combustion air for being passed through flat flame burner 1.
As shown in Figure 1, in the present embodiment, be equipped on flat flame burner pipeline and flameless gas burner pipeline for flow into
The air flow rate adjustment valve 7 and air mass flow orifice plate 8 that row is accurately adjusted.Circulation line is equipped with for sucking to circulating fan 4
The flue gas flow regulating valve 5 that is accurately controlled of exhaust gas volumn and flue gas flow orifice plate 6.Flat flame burner pipeline is equipped with for examining
It surveys by the oxygen content testing agency 9 of oxygen content in the combustion air of flue gas dilution.
Heating furnace NOx emission can be greatly reduced in the present invention, realize the ultralow NO of high-temperature heatingx1 energy of discharge-flat flame burner
Guarantee to be stablized with combustion gas by the combustion air of flue gas dilution and burn and form open and flat flame, since the oxygen in combustion air contains
Amount is greatly reduced, flat flame burner 1 burn caused by local high temperature zone be reduced, burner NOx generation amount accordingly reduces, in turn
Bring entire top heating region entirety NOxDischarge is greatly reduced；After combustion air is by combustion fan 3 and heat exchanger preheating,
It is sent directly into flameless gas burner 2, is burnt under normal heating technique by flameless combustion technology, flameless gas burner 2 switches to nonflame
When working under state, burner flame disappears, and NOx emission is greatly reduced, and highest NOx emission value can reduce by 90%, and then bring whole
A side heating region entirety NOxDischarge is greatly reduced.The present invention is made by " flameless combustion+circulating flue gas flat flame " technology
With, significantly reduce the local high temperature zone in heating furnace, thus be greatly improved fire box temperature distribution uniformity, improve
Control of industrial furnace home.The present invention passes through the use of " circulating flue gas flat flame " technology, can guarantee to be formed under hypoxic condition and stablize
The flat flame of burning reduces the NO of flat flame burner 1 while guaranteeing heating processxDischarge.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of heating furnace heating system for reducing discharged nitrous oxides, it is characterised in that: be located at heating furnace roof including several
Portion and be suitable for low-oxygen environment under burn flat flame burner, several be located at heating furnace side and can flameless combustion nonflame burn
Mouth, combustion fan, circulating fan, flue gas-combustion air heat exchanger and distribution pipe, combustion fan entrance are connected to combustion air
Source, outlet are connected with combustion air pipeline, and combustion air pipeline is connected to distribution pipe after flue gas-combustion air heat exchanger,
Distribution pipe by flat flame burner piping connection to flat flame burner, by flameless gas burner piping connection to flameless gas burner, heating furnace
Exhanst gas outlet is connected with flue gas pipeline, and flue gas pipeline is divided into two-way after flue gas-combustion air heat exchanger, passes through discharge all the way
Piping connection is connected to circulating fan entrance by circulation line to chimney, another way, and circulating fan outlet passes through access pipeline
Access flat flame burner pipeline.
2. reducing the heating furnace heating system of discharged nitrous oxides as described in claim 1, it is characterised in that: flat flame burner pipe
The air flow rate adjustment valve and air mass flow orifice plate for accurately being adjusted to flow are equipped on road and flameless gas burner pipeline.
3. reducing the heating furnace heating system of discharged nitrous oxides as described in claim 1, it is characterised in that: on circulation line
Equipped with the flue gas flow regulating valve and flue gas flow orifice plate for being accurately controlled to the exhaust gas volumn that circulating fan sucks.
4. reducing the heating furnace heating system of discharged nitrous oxides as described in claim 1, it is characterised in that: flat flame burner pipe
Road is equipped with the oxygen content testing agency for detecting oxygen content in the combustion air by flue gas dilution.
5. a kind of heating furnace heating means for reducing discharged nitrous oxides, it is characterised in that: low using being suitable at the top of heating furnace
The flat flame burner to burn under oxygen environment is heated, is heated in heating furnace side using the flameless gas burner of energy flameless combustion,
The flue gas that heating furnace burning generates is recycled, then flue gas and combustion air are exchanged heat by flue gas-combustion air heat exchanger, after heat exchange
Combustion air each lead into flat flame burner and flameless gas burner, flue gas a part after heat exchange pass through chimney discharge, another part
It is mixed with the combustion air for being passed through flat flame burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155065.8A CN109099721A (en) | 2018-09-29 | 2018-09-29 | Reduce the heating furnace heating system and method for discharged nitrous oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155065.8A CN109099721A (en) | 2018-09-29 | 2018-09-29 | Reduce the heating furnace heating system and method for discharged nitrous oxides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109099721A true CN109099721A (en) | 2018-12-28 |
Family
ID=64867867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811155065.8A Pending CN109099721A (en) | 2018-09-29 | 2018-09-29 | Reduce the heating furnace heating system and method for discharged nitrous oxides |
Country Status (1)
| Country | Link |
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| CN (1) | CN109099721A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974463A (en) * | 2019-03-27 | 2019-07-05 | 眉山士达新材料有限公司 | Vehicle bottom formula roaster energy-saving and emission-reduction system |
| CN112097514A (en) * | 2020-09-29 | 2020-12-18 | 江苏天淮钢管有限公司 | Ultralow-emission annular furnace |
| CN115628450A (en) * | 2022-10-18 | 2023-01-20 | 南京年达炉业科技有限公司 | Gas burner, gas heating system and marching type copper ingot gas heating furnace |
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2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974463A (en) * | 2019-03-27 | 2019-07-05 | 眉山士达新材料有限公司 | Vehicle bottom formula roaster energy-saving and emission-reduction system |
| CN112097514A (en) * | 2020-09-29 | 2020-12-18 | 江苏天淮钢管有限公司 | Ultralow-emission annular furnace |
| CN112097514B (en) * | 2020-09-29 | 2022-03-18 | 江苏天淮钢管有限公司 | Ultralow-emission annular furnace |
| CN115628450A (en) * | 2022-10-18 | 2023-01-20 | 南京年达炉业科技有限公司 | Gas burner, gas heating system and marching type copper ingot gas heating furnace |
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