CN215372477U - Staged combustion paired independent combined type ultralow NOx double-heat-storage burner - Google Patents
Staged combustion paired independent combined type ultralow NOx double-heat-storage burner Download PDFInfo
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- CN215372477U CN215372477U CN202120875001.6U CN202120875001U CN215372477U CN 215372477 U CN215372477 U CN 215372477U CN 202120875001 U CN202120875001 U CN 202120875001U CN 215372477 U CN215372477 U CN 215372477U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
A staged combustion paired independent combined type ultralow NOx double regenerative burner belongs to the field of thermal engineering. The current crisscross two regenerative burner in left and right sides of main solution produces local thermal stress easily, leads to the burner block to break, influences life. The nozzles are arranged on the air nozzle burner block and the gas nozzle burner block of the burner, the central lines of the nozzles form injection angles with the central lines of the air heat storage box and the gas heat storage box respectively, and the nozzles on the air nozzle burner block and the gas nozzle burner block are arranged in an inverted splayed shape. The utility model effectively inhibits the generation of NOx in the combustion process, avoids the oxidation and decarburization of the billet in the heating process, reduces the oxidation burning loss, improves the billet heating quality, is convenient for reserving a furnace wall refractory castable thermal expansion gap in a narrow space between an air heat storage chamber and a gas heat storage chamber, and has longer service life of the burner block.
Description
Technical Field
The utility model relates to a staged combustion and paired combined type ultralow NOx double-regenerative burner for a heating furnace or a heat treatment furnace, belonging to the field of thermal engineering.
Background
When the existing double heat storage burners for the heating furnace are designed and installed, the rear end faces of burner bricks are fixed at the front ends of double heat storage burner bodies, the front end faces are flush with refractory castable of a furnace wall, refractory materials are poured around the burner bricks, the burner bricks are large and are arranged tightly, only 1 row of anchor bricks can be arranged between the burner bricks, 1 thermal expansion joint of 5-10mm needs to be arranged between the burner bricks in consideration of expansion of the refractory castable of the furnace wall at high temperature, and the anchor bricks fixed on a steel plate of the furnace wall cannot play a role of pulling the burner bricks through the anchor refractory castable, so that the burner bricks incline in the furnace under thermal expansion stress and airflow flushing after the heating furnace or the heat treatment furnace operates for a period of time, and even collapse accidents of the furnace wall and the like are caused. In addition, when the existing double heat-accumulating burners are designed and installed, the left and right staggered arrangement patterns of the nozzles of the air and gas heat-accumulating burners are used, so that the whole heat supply section is subjected to whole-section tissue combustion, generally, 6-10 pairs of double heat-accumulating burners are arranged in each heat supply section of a heating furnace or heat treatment to form a whole, and in the production process, 1 pair of burners are failed and cannot be put into use, so that other heat-accumulating burners of the whole heat supply section cannot normally work, and only the heat supply section can be closed, so that the whole heating furnace is stopped or low-load production is maintained. The existing left and right staggered double heat accumulation burners have rectangular flat nozzles for air and coal gas heat accumulation burner nozzles, and a burner block works in a high-temperature area in a furnace for a long time and is easy to produce local thermal stress, so that the burner block is broken, and the service life of the burner block is influenced. Meanwhile, the nozzles of the air and gas heat accumulation burners are rectangular, so that air and gas are not sufficiently mixed in the furnace, the uniformity of the furnace temperature is poor, and NO in smoke gas is generatedXThe emission exceeds the standard and the like.
SUMMERY OF THE UTILITY MODEL
The technical scheme of the utility model is to research and develop the staged combustion and paired combined type ultralow NOx double heat storage burner for the heating furnace or the heat treatment furnace aiming at the defects of the prior art.
A graded-combustion paired independent combined ultra-low NOx double-heat-storage burner comprises an air heat-storage box 1, a gas heat-storage box 2, a gas nozzle burner block 5, an air nozzle burner block 4, a furnace wall refractory castable 7 and a heat accumulator 3; the outer layers of the air heat storage box 1 and the gas heat storage box 2 are additionally provided with a heat accumulator 3, the bottom end of the air heat storage box 1 is additionally provided with an air nozzle burner block 4, the bottom end of the gas heat storage box 2 is additionally provided with a gas nozzle burner block 5, the bottom of the air heat storage box 1 after being additionally provided with the air nozzle burner block 4 is provided with a furnace wall refractory castable 7, and the bottom of the gas heat storage box 2 after being additionally provided with the gas nozzle burner block 5 is provided with the furnace wall refractory castable 7;
the air nozzle burner block 4 and the gas nozzle burner block 5 are provided with nozzles, the central lines of the nozzles form injection angles with the central lines of the air heat storage box and the gas heat storage box respectively, and the nozzle directions of the air nozzle burner block 4 and the gas nozzle burner block 5 are arranged in an inverted splayed shape.
And a thermal expansion gap 8 is added between the furnace wall refractory castable 7 at the bottoms of the air heat storage box 1 and the coal gas heat storage box 2.
The spout is circular.
The angle of the injection angle is between 20 and 35 degrees.
The width of the thermal expansion seam 8 is 5-10 mm.
The number of the nozzles on the air nozzle burner block 4 and the gas nozzle burner block 5 is 6, and the nozzles on each burner block are arranged in 3 rows and 2 columns.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the device mainly comprises an air heat storage box, a gas nozzle burner block, an air nozzle burner block, an anchoring block, a furnace wall castable, a heat accumulator and a baffle block, wherein the heat accumulator and the baffle block are positioned in the heat storage box; the front end of the air and gas heat storage box is provided with a miniaturized air and gas nozzle burner block, 6 nozzles are respectively designed on the air and gas nozzle burner block, the nozzles are arranged in 3 rows and 2 columns, the included angle between the central line of the nozzles and the central line of the heat storage box body is an injection angle, the angle of the injection angle is between 20 and 35 degrees, and different injection angles are adopted on heating furnaces or heat treatment furnaces with different furnace widths; the periphery of the front end parts of the hollow and gas regenerators is provided with a plurality of anchoring bricks for anchoring furnace wall refractory castable and burner block front end castable, and the anchoring bricks are arranged at the front ends of the hollow and gas regenerators, so that the furnace wall refractory castable is anchored more firmly, and a furnace wall refractory castable thermal expansion gap is reserved in a narrow space between the hollow and gas regenerators conveniently; the nozzle end of the gas heat storage cavity and the nozzles of the air heat storage cavity are arranged according to 3 rows and 2 columns, firstly, the gas and the air sprayed from the 1 st column of the gas nozzles and the 1 st column of the air nozzles which are adjacent to each other are mixed and combusted in the furnace, and then the gas and the air sprayed from the second column of the gas nozzles and the air are mixed and combusted for the second time, so that the mixing time of the gas and the air is prolonged, the length of flame is prolonged, the temperature of a high-temperature region of the flame is reduced, and the temperature distribution in the width direction of the furnace is homogenized. In addition, because the nozzle burner block at the front end of the air-gas regenerator and the nozzle burner block at the front end of the gas regenerator are provided with 6 nozzles, the gas or the air in the regenerator is divided, when the gas and the air are sprayed into the furnace from the nozzles at a high speed for mixed combustion, a uniform negative pressure field is formed at the 6 nozzles, more flue gas can be sucked into a combustion area, the oxygen concentration of the combustion area is diluted, the temperature of a flame high-temperature area is reduced, a high-temperature and low-oxygen combustion atmosphere is formed, the generation of NOx in the combustion process is effectively inhibited, the oxidation and decarburization of a billet in the heating process are avoided, the oxidation burning loss is reduced, and the billet heating quality is improved.
Further improvement: the nozzle direction of the burner block is changed from the traditional external splay shape into a double-inverted-V shape, the double-inverted-V shape faces to the central line direction of a double-heat-storage burner formed by combining an empty heat storage box and a coal gas heat storage box, the empty heat storage box and the coal gas heat storage box are combined in pairs to form an independent combustion unit, secondary combustion is realized, the flame length of the burner is prolonged, the temperature of a high-temperature region of the flame is reduced, the temperature uniformity in the furnace width direction is improved, meanwhile, the combined double-heat-storage burner can be started and stopped on line, and the work of other paired combined burners in the heat supply section is not influenced;
further improvement: after the existing hollow and gas nozzle bricks are miniaturized, the mounting positions of the anchoring bricks are moved to the front ends of the hollow and gas heat storage boxes from the side walls, a space with a thermal expansion gap is reserved between the hollow and gas heat storage boxes, meanwhile, the effect of anchoring the refractory castable of the furnace wall by the anchoring bricks is increased, the working reliability of the double heat storage burners is improved, and long-life and high-efficiency operation of the heating furnace and the heat treatment furnace is realized.
Further improvement: the nozzles of the air and gas nozzle brick are changed from vertical rectangular nozzles in 1 row and 2 columns to 6 circular nozzles in 3 rows and 2 columns, so that porous dispersion combustion is formed, the local stress around the nozzles is reduced, and the service life of the air and gas nozzle brick is prolonged.
The utility model has the advantages that:
(1) the traditional external splayed shape of the nozzle direction of the nozzle brick is changed into a double-shaped shape, the double-shaped shape faces to the direction of the central line of the nozzle formed by combining the air heat storage boxes and the gas heat storage boxes to form an inverted splayed shape, the air heat storage boxes and the gas heat storage boxes are combined in pairs to form an independent combustion unit, staged combustion is realized, the nozzle can be opened and closed on line, when 1 pair or a plurality of pairs of 6-10 pairs of nozzles in a heating section of a heating furnace have faults, the corresponding fault pair nozzle is closed, and the work of other pairs of nozzles in the heating section is not influenced;
(2) the nozzle end of the gas heat storage cavity and the nozzles of the air heat storage cavity are arranged according to 3 rows and 2 columns, firstly, the gas and the air sprayed from the 1 st column of the gas nozzles and the 1 st column of the air nozzles which are adjacent to each other are firstly mixed and combusted in the furnace, and then the gas and the air sprayed from the 2 nd column of the gas nozzles meet to complete secondary mixed combustion, so that the mixing time of the gas and the air is prolonged, the staged combustion is realized, the length of flame is prolonged, the temperature of a high-temperature region of the flame is reduced, and the temperature distribution in the width direction of the furnace is homogenized. In addition, because the nozzle burner block at the front end of the air-gas regenerator and the nozzle burner block at the front end of the gas regenerator are provided with 6 nozzles, the gas or the air in the regenerator is divided, when the gas and the air are sprayed into the furnace from the nozzles at a high speed for mixed combustion, a uniform negative pressure field is formed at the 6 nozzles, more flue gas can be sucked into a combustion area, the oxygen concentration of the combustion area is diluted, the temperature of a flame high-temperature area is reduced, a high-temperature and low-oxygen combustion atmosphere is formed, the generation of NOx in the combustion process is effectively inhibited, the oxidation and decarburization of a billet in the heating process are avoided, the oxidation burning loss is reduced, and the billet heating quality is improved.
(3) The coal gas heat accumulation chamber is arranged adjacent to the air heat accumulation chamber, a plurality of anchoring bricks are arranged around the front end part of the air and coal gas heat accumulation chambers and used for anchoring furnace wall refractory castable and burner block front end refractory castable, the anchoring bricks are arranged at the front end of the heat accumulation chambers and not only anchor the furnace wall refractory castable more firmly, but also are convenient for reserving furnace wall refractory castable thermal expansion gaps in narrow spaces between the air and coal gas heat accumulation chambers.
(4) The nozzles of the air and gas nozzle brick are changed from vertical rectangular nozzles in 1 row and 2 columns to 6 circular nozzles in 3 rows and 2 columns, so that the service life of the nozzle brick is longer.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a schematic diagram of the arrangement of the nozzles, the arrangement of the anchoring bricks and the arrangement of the thermal expansion joints of the nozzles.
FIG. 3 is a schematic view of the configuration of the spray angle of the present invention;
wherein: the heat-storage furnace comprises an air heat-storage box 1, a gas heat-storage box 2, a heat-storage body 3, an air nozzle burner block 4, a gas nozzle burner block 5, an anchoring block 6, a furnace wall refractory castable 7 and a thermal expansion joint 8.
Detailed Description
The utility model is described in detail below with reference to the drawings.
As shown in the figure, the graded combustion and paired independent combined type ultralow NOx double-heat-storage burner for the heating furnace and the heat treatment furnace mainly comprises an air heat-storage box 1, a gas heat-storage box 2, an air nozzle burner block 4, a gas nozzle burner block 5, an anchoring block 6, furnace wall refractory castable 7 and a heat accumulator 3 positioned in the air heat-storage box and the gas heat-storage box; the front end of the air and gas heat storage box is provided with a miniaturized air and gas nozzle burner block, 6 nozzles are respectively designed on the air and gas nozzle burner block, the nozzles are arranged in 3 rows and 2 columns, the included angle between the central line of the nozzles and the central line of the heat storage box body is an injection angle beta, the angle range of the injection angle beta is 20-35 degrees, and different injection angles are adopted on heating furnaces or heat treatment furnaces with different furnace widths; a plurality of anchoring bricks 6 are arranged around the front end part of the air and gas regenerator and are used for anchoring furnace wall refractory castable 7, and the anchoring bricks 6 are arranged around the front end of the air and gas regenerator, so that the furnace wall refractory castable is anchored more firmly, and a narrow space between the air regenerator 1 and the gas regenerator 2 is convenient for reserving a furnace wall refractory castable 7 thermal expansion gap;
a space is reserved for the furnace wall refractory castable thermal expansion joint 8; the nozzles of the air nozzle burner block and the nozzles of the gas nozzle burner block are arranged according to 3 rows and 2 columns, firstly, the gas and the air sprayed from the 1 st column of the gas nozzle and the 1 st column of the air nozzle which are adjacent to each other are mixed and combusted in the furnace, then, the gas and the air sprayed from the air nozzle and the gas nozzle in the second column are mixed and combusted for the second time, so that the mixing time of the gas and the air is prolonged, the length of flame is prolonged, the temperature of a flame high-temperature area is reduced, the temperature distribution in the furnace width direction is homogenized, in addition, as 6 nozzles are arranged on the nozzle burner block at the front end of the air and gas heat accumulation chamber, the gas or the air in the heat accumulation chamber is divided, when the gas and the air are mixed and combusted in the furnace through the nozzles at high speed, uniform negative pressure fields are formed at the 6 nozzles, more smoke can be sucked into a combustion area, and the oxygen concentration in the combustion area is diluted, the temperature of a flame high-temperature area is reduced, a high-temperature and low-oxygen combustion atmosphere is formed, the generation of NOx in the combustion process is effectively inhibited, the oxidation and decarburization of the billet in the heating process are avoided, the oxidation burning loss is reduced, and the heating quality of the billet is improved.
When furnace wall refractory castable 7 in front of the air nozzle burner block 4 and the gas nozzle burner block 5 is poured, the air nozzle burner block 4 and the gas nozzle burner block 5 are poured to be used as an inner mold of the furnace wall refractory castable 7, and simultaneously, the furnace wall refractory castable 7 is reserved in nozzle extension through channels of the air nozzle burner block 4 and the gas nozzle burner block 5, and the size and the angle of the channels are consistent with those of nozzles of the air nozzle burner block 4 and the gas nozzle burner block 5;
in the construction and installation stage of the heating furnace or the heat treatment furnace, after the burner air heat storage box 1, the gas heat storage box 2, the air nozzle burner block 4, the gas nozzle burner block 5 and the anchoring block 6 are installed and fixed, when the refractory castable 7 of the furnace wall is poured, a thermal expansion gap 8 is arranged at the middle position of each air heat storage box 1 and each gas heat storage box 2, and the size of the gap is 5-10 mm;
the working principle is as follows: firstly, when the burner works, coal gas and air respectively enter the air heat storage box 1 and the coal gas heat storage box 2 through the pressure of a pipe network, after the heat of the air and the coal gas is accumulated by the heat accumulator 3, the temperature is up to 1000 ℃, the heat-accumulated air and coal gas are sprayed out through the nozzles of the air nozzle burner block 4 and the coal gas nozzle burner block 5, as the nozzles of the air nozzle burner block 4 and the gas nozzle burner block 5 are arranged according to 3 rows and 2 columns, firstly, the gas and the air sprayed from the 1 st column of the gas nozzle and the 1 st column of the air nozzle which are adjacent to each other complete primary mixed combustion in the furnace, then the gas and the air sprayed from the 2 nd column of the air nozzle meet each other to complete secondary mixed combustion, therefore, the mixing time of coal gas and air is prolonged, staged combustion is realized, the length of flame is prolonged, the temperature of a high-temperature region of flame is reduced, and the temperature distribution in the width direction of the furnace is homogenized. In addition, because the nozzle burner block at the front end of the air-gas regenerator and the nozzle burner block at the front end of the gas regenerator are provided with 6 nozzles, the gas or the air in the regenerator is divided, when the gas and the air are sprayed into the furnace from the nozzles at a high speed for mixed combustion, a uniform negative pressure field is formed at the 6 nozzles, more flue gas can be sucked into a combustion area, the oxygen concentration of the combustion area is diluted, the temperature of a flame high-temperature area is reduced, a high-temperature and low-oxygen combustion atmosphere is formed, the generation of NOx in the combustion process is effectively inhibited, the oxidation and decarburization of a billet in the heating process are avoided, the oxidation burning loss is reduced, and the billet heating quality is improved.
Claims (5)
1. The utility model provides a two regenerative burner of ultralow NOx of independent combination formula in pairs burns in grades which characterized in that: the burner comprises an air heat storage box (1), a gas heat storage box (2), a gas nozzle burner block (5), an air nozzle burner block (4), a furnace wall refractory castable (7) and a heat accumulator (3); the outer layers of the air heat storage box (1) and the coal gas heat storage box (2) are covered with a heat storage body (3), the bottom end of the air heat storage box (1) is additionally provided with an air nozzle burner block (4), the bottom end of the coal gas heat storage box (2) is additionally provided with a coal gas nozzle burner block (5), the bottom of the air heat storage box (1) after being additionally provided with the air nozzle burner block (4) is provided with a furnace wall refractory castable (7), and the bottom of the coal gas heat storage box (2) after being additionally provided with the coal gas nozzle burner block (5) is provided with the furnace wall refractory castable (7);
the air nozzle burner block (4) and the gas nozzle burner block (5) are provided with nozzles, the central lines of the nozzles form injection angles with the central lines of the air heat storage box and the gas heat storage box respectively, and the nozzle directions of the air nozzle burner block (4) and the gas nozzle burner block (5) are arranged in an inverted splayed shape.
2. The staged combustion paired independent combined ultra-low NOx double regenerative burner as claimed in claim 1, wherein: and a thermal expansion gap (8) is added between the furnace wall refractory castable (7) at the bottoms of the air heat storage box (1) and the coal gas heat storage box (2).
3. The staged combustion paired independent combined ultra-low NOx double regenerative burner as claimed in claim 1, wherein: the spout is circular.
4. The staged combustion paired independent combined ultra-low NOx double regenerative burner as claimed in claim 1, wherein: the angle of the injection angle is between 20 and 35 degrees.
5. The staged combustion paired independent combined ultra-low NOx double regenerative burner as claimed in claim 2, wherein: the width of the thermal expansion gap (8) is 5-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120875001.6U CN215372477U (en) | 2021-04-26 | 2021-04-26 | Staged combustion paired independent combined type ultralow NOx double-heat-storage burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120875001.6U CN215372477U (en) | 2021-04-26 | 2021-04-26 | Staged combustion paired independent combined type ultralow NOx double-heat-storage burner |
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| Publication Number | Publication Date |
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| CN215372477U true CN215372477U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120875001.6U Active CN215372477U (en) | 2021-04-26 | 2021-04-26 | Staged combustion paired independent combined type ultralow NOx double-heat-storage burner |
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| Country | Link |
|---|---|
| CN (1) | CN215372477U (en) |
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2021
- 2021-04-26 CN CN202120875001.6U patent/CN215372477U/en active Active
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