CN214664418U - Natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner - Google Patents
Natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner Download PDFInfo
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- CN214664418U CN214664418U CN202120609321.7U CN202120609321U CN214664418U CN 214664418 U CN214664418 U CN 214664418U CN 202120609321 U CN202120609321 U CN 202120609321U CN 214664418 U CN214664418 U CN 214664418U
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- heat storage
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- blast furnace
- natural gas
- nitrogen oxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner in an industrial furnace. The two heat storage tanks are arranged up and down, the interval between the two heat storage tanks is 310-590mm, and the gas pipe is buried between the two heat storage tanks; the outer end of the gas pipe is fixedly connected with a gas ejector; the outer parts of the two heat storage boxes are wrapped by steel plates, the inner lining is provided with a castable, the castable and the steel plates are fixed by anchoring nails, and the inner parts of the castable and the steel plates are provided with honeycomb heat accumulators; the edges of the two heat storage boxes are respectively provided with a heat storage chamber swirler. The utility model discloses an adopt heat accumulation formula high temperature combustion technique, when firing the natural gas, the air is single heat accumulation, when using blast furnace gas as fuel, what adopted is that air and blast furnace gas double heat accumulation preheat. Namely, the combustion-supporting air and the blast furnace gas at normal temperature are simultaneously preheated to about 1000 ℃. The combustion gas can be switched in normal production, and the combustion process is the principle of volume combustion, so that the emission of nitrogen oxide is reduced.
Description
Technical Field
The utility model relates to a two kinds of fuel low NOx heat accumulation formula burner field in the industrial furnace, especially relate to a natural gas and blast furnace gas dual-purpose low nitrogen oxide nozzle.
Background
In industrial kilns in the industries of metallurgy, petrifaction, building materials, electric power, fire resistance, boilers, machinery and the like, it is often desired on site that one burner can use two kinds of gas as fuel. That is, one industrial furnace can use not only blast furnace gas having a very low calorific value but also natural gas having a high calorific value as fuel, and it is desired that pipelines and burners for two kinds of fuels can be freely switched without causing any change and without stopping the production of the industrial furnace. On site, it is hoped that any one of the two fuels can be adopted only by switching the main valves of the two fuels during production, and when any one of the two fuels is adopted, the flue gas after combustion must meet the requirement of environmental protection, namely nitrogen oxide (NOx) in the products of combustion meets the requirement of national environmental protection standard.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provide a dual-purpose low-nitrogen oxide burner for different gases.
The utility model discloses a following technical scheme realizes above-mentioned purpose: natural gas and blast furnace gas dual-purpose low nitrogen oxide nozzle, including two heat accumulation casees, wherein: the two heat storage tanks are arranged up and down, the interval between the two heat storage tanks is 310-590mm, and the gas pipe is buried between the two heat storage tanks; the outer end of the gas pipe is fixedly connected with a gas ejector; the outer parts of the two heat storage boxes are wrapped by steel plates, the inner lining is provided with a castable, the castable and the steel plates are fixed by anchoring nails, and the inner parts of the castable and the steel plates are provided with honeycomb heat accumulators; the edges of the two heat storage boxes are respectively provided with a heat storage chamber swirler.
Further: the two heat storage boxes are respectively a blast furnace gas heat storage box and an air heat storage box, and the two heat storage boxes are respectively communicated through blast furnace gas heat storage box connecting pipes and air heat storage box connecting pipes.
Further: the honeycomb heat accumulator is a honeycomb body with the specific surface area of 500-800m2/m3, and the hole type comprises a round hole, a square hole and a hexagonal hole.
Further: the regenerator swirler is made of corundum-mullite castable, and the radial angle A is 5 degrees to-12 degrees, and the axial angle B is 10 degrees to-18 degrees: w is 5-14 Nm/s.
Further: the gas pipe is a natural gas pipeline made of heat-resistant pipes, the gas injector is a natural gas injector which is an embedded multi-stage injection guide pipe and an injection guide pipe, the natural gas injector is made of seamless steel pipes made of 1Cr25Ni20Si2, and the number and the angle of the injection guide pipes are matched with the swirl angle (the swirl direction and the angle of a nozzle of an air regenerator) of an air regenerator.
Further: and the surfaces of the two heat storage boxes are provided with quick access doors.
Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model discloses an adopt heat accumulation formula high temperature combustion technique, when firing the natural gas, the air is single heat accumulation, when using blast furnace gas as fuel, what adopted is that air and blast furnace gas double heat accumulation preheat. Namely, the combustion-supporting air and the blast furnace gas at normal temperature are simultaneously preheated to about 1000 ℃. The combustion gas can be switched in normal production, and the combustion process is the principle of volume combustion, so that the emission of nitrogen oxide is reduced.
Drawings
FIG. 1 is a structural diagram of a low-nitrogen oxide burner for both natural gas and blast furnace gas;
FIG. 2 is a partial enlarged view of a natural gas nozzle of the low-nitrogen oxide burner for both natural gas and blast furnace gas;
FIG. 3 is a cross-sectional view of a dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas;
FIG. 4 is a schematic view of a burner kiln installation;
the reference numerals are explained below:
1. the natural gas pipe 2, the air heat storage tank connecting pipe 3, the air heat storage tank 4, the gas heat storage tank 5, the gas heat storage tank access door 6, the blast furnace gas heat storage tank connecting pipe 7, the air heat storage tank access door 8, the heat accumulator 9, the air heat storage chamber swirler 10, the blast furnace gas heat storage chamber swirler 11 and the natural gas nozzle 12 sealing ring.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
example 1
As shown in figure 1, the two-purpose low-nitrogen oxide burner for natural gas and blast furnace gas is provided, 4 burners are symmetrically arranged in the left and right direction when in use, as shown in figure 4, the burners are embedded in the furnace wall, two heat storage boxes of each burner are arranged up and down, the middle interval is 310-590mm, and a heat-resistant natural gas pipe is buried between the two heat storage boxes; be equipped with the sealing ring between brickwork and the heat accumulation case shell, the sealing ring material is: 1Cr18Ni9Ti, and a sealing ring tightly hoops the outer diameter of the heat storage box and is welded with the steel plate outside the heat storage box into a whole. The natural gas ejector is fixedly connected with the outer end of the natural gas pipe and is a built-in multi-stage ejection guide pipe, the ejection guide pipe is composed of seamless steel pipes made of 1Cr25Ni20Si2 materials, the number and the angle of the ejection guide pipe are matched with the rotational flow angle of the cyclone of the air regenerator, so that the natural gas is forced to carry out volume combustion under the low-oxygen condition, namely, flame is ejected, rotated and combusted simultaneously, the flame is not concentrated in a high-temperature area, the combustion is carried out in the whole furnace, the flame has no obvious shape, and the high temperature with special concentration cannot be formed. This allows for a substantial reduction in nitrogen oxides (NOx) in the combustion products of the burner. The outer parts of the two heat storage boxes are wrapped by steel plates, the inner linings are provided with casting materials, the casting materials and the steel plates are fixed by anchoring nails, and the inner parts of the two heat storage boxes are provided with porous and round hole type honeycomb heat storage bodies which are formed by extrusion and matched with a combined tower, wherein each honeycomb heat storage body is a honeycomb body with the specific surface area of 500-m 2/m3, and the porous heat storage bodies also comprise square holes, hexagonal holes and the like. The edges of the two heat storage boxes of each burner are respectively provided with a heat storage chamber swirler which is made of high-strength corundum-mullite castable, and the radial angle A is 5 degrees to-12 degrees, and the axial angle B is 10 degrees to-18 degrees: w is 5-14 Nm/s. The cyclone of the regenerator is provided with a plurality of three-dimensional small holes. The design and the structure of the cyclone of the heat storage chamber and the structure of the heat storage box ensure that the combustion after the fuel and the combustion air are mixed is volume combustion instead of concentrated combustion, thereby reducing the emission of nitrogen oxide.
The regenerator swirler is a conventional element in the burner and can be directly purchased and installed.
During use, when natural gas is combusted, in a period, firstly, air enters the blast furnace gas heat storage boxes and the air heat storage boxes of A1 and A2, the natural gas is sprayed out from a natural gas injector between the two heat storage boxes of each burner, the combustion is carried out in the furnace, the generated high-temperature flue gas is discharged from the burners B1 and B2, the heat storage bodies in the burners B1 and B2 are heated by the high-temperature flue gas, and the temperature of the high-temperature flue gas entering due to heat transfer can be reduced to below 200 ℃. Then the air is fed in the exchange directions B1 and B2, the smoke is discharged from the sides A1 and A2, and the air entering the sides B1 and B2 passes through the heat accumulators in the inner heat accumulators B1 and B2 to preheat the air at the normal temperature to about 1000 ℃. Thus, the device is used for repeatedly (one period of 90 seconds) and the air can be preheated to about 1000 ℃ by utilizing the residual temperature of the flue gas and the heat accumulator.
When the blast furnace gas is combusted, the principle is the same as that of the natural gas combustion, and the difference is that the blast furnace gas heat storage box of each burner is filled with the blast furnace gas, and the air heat storage box is filled with air, so that the air and the blast furnace gas can be simultaneously preheated by the structure.
When the furnace is produced and different fuels need to be replaced, for example, when the furnace needs blast furnace gas as fuel, the main valve of natural gas is closed, and the main valve of blast furnace gas is opened, so that the heat storage box can simultaneously preheat air and blast furnace gas to 1000 ℃ for volume combustion. When the furnace needs natural gas as fuel, the main valve of blast furnace gas is closed, the main valve of natural gas is opened, then the heat-accumulating box can preheat the air to 1000 deg.C, the natural gas can be jetted from jet pipe pre-embedded in the heat-accumulating box, and the natural gas and high-temp. air can be undergone the process of volume combustion in the furnace.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (6)
1. Natural gas and blast furnace gas dual-purpose low nitrogen oxide nozzle, including two heat accumulation casees, its characterized in that: the two heat storage tanks are arranged up and down, the interval between the two heat storage tanks is 310-590mm, and the gas pipe is buried between the two heat storage tanks; the outer end of the gas pipe is fixedly connected with a gas ejector; the outer parts of the two heat storage boxes are wrapped by steel plates, the inner lining is provided with a castable, the castable and the steel plates are fixed by anchoring nails, and the inner parts of the castable and the steel plates are provided with honeycomb heat accumulators; the edges of the two heat storage boxes are respectively provided with a heat storage chamber swirler.
2. The dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas as recited in claim 1, wherein: the two heat storage boxes are respectively a blast furnace gas heat storage box and an air heat storage box, and the two heat storage boxes are respectively communicated through blast furnace gas heat storage box connecting pipes and air heat storage box connecting pipes.
3. The dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas as recited in claim 1, wherein: the honeycomb heat accumulator is a honeycomb body with the specific surface area of 500-800m2/m3, and the hole type comprises a round hole, a square hole and a hexagonal hole.
4. The dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas as recited in claim 1, wherein: the regenerator swirler is made of corundum-mullite castable, and the radial angle A is 5 degrees to-12 degrees, and the axial angle B is 10 degrees to-18 degrees: w is 5-14 Nm/s.
5. The dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas as recited in claim 1, wherein: the gas pipe is a natural gas pipeline made of heat-resistant pipes, the gas injector is a natural gas injector which is an embedded multi-stage injection guide pipe and an injection guide pipe, the natural gas injector is made of seamless steel pipes made of 1Cr25Ni20Si2, and the number and the angle of the injection guide pipes are matched with the swirl angle of the air regenerator swirler.
6. The dual-purpose low-nitrogen oxide burner for natural gas and blast furnace gas as recited in claim 1, wherein: and the surfaces of the two heat storage boxes are provided with quick access doors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120609321.7U CN214664418U (en) | 2021-03-25 | 2021-03-25 | Natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120609321.7U CN214664418U (en) | 2021-03-25 | 2021-03-25 | Natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214664418U true CN214664418U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120609321.7U Active CN214664418U (en) | 2021-03-25 | 2021-03-25 | Natural gas and blast furnace gas dual-purpose low-nitrogen oxide burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214664418U (en) |
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2021
- 2021-03-25 CN CN202120609321.7U patent/CN214664418U/en active Active
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