CN210398903U - Ultra-low NOx and CO emission efficient flame-stabilizing gas burner for high and low furnace temperature - Google Patents

Abstract

The utility model discloses a high, low furnace temperature is with ultralow NOx, the high-efficient steady flame gas burner of CO emission, including stationary flow fire basin brick, stationary flow cooling body, fire basin brick cover, gas rifle subassembly, changming lamp subassembly, combustor barrel, air register butterfly valve. The utility model discloses can realize the burning of steady flame circular flame, flame shaping is good, and flame formation is regular, does not send out flame wafing. The utility model discloses can realize high-efficient flame, the effectual CO that has reduced simultaneously generates, the utility model discloses a hierarchical burning, the reduction flame central temperature that form fuel, three kinds of technical combinations that form the flue gas backward flow make the combustor realize ultralow NOx and discharge. The utility model discloses can adapt to height furnace temperature: in a low-temperature hearth, the applicable temperature is 200-600 ℃, and the splayed closed-up of the fire pan brick cover is increased, so that CO generation is avoided; in a high-temperature hearth, the applicable temperature is 800-1200 ℃; through increasing the brazier brick cover, the effectual influence of avoiding furnace high temperature radiation to the outside main shower nozzle of stationary flow brazier brick cover.

Description

Ultra-low NOx and CO emission efficient flame-stabilizing gas burner for high and low furnace temperature

Technical Field

The invention belongs to the field of petrochemical burners, and particularly relates to a high-efficiency flame-stabilizing gas burner which can be suitable for a low-temperature heating furnace with small load, a high-temperature furnace with large load, and heating furnaces with burners close to a furnace tube of the heating furnace or heating furnaces with high requirements on flame, and has ultralow NOx and CO emission.

Background

The problems that flame of a burner is not well formed, flame is drifted, a furnace tube is licked, the local temperature of the furnace tube is ultrahigh and the like in a heating furnace of a petrochemical refinery influence the service life and the use safety of the furnace tube of the heating furnace, and simultaneously, the state puts forward more strict requirements on the emission of nitrogen oxides in the emission of flue gas after combustion.

In some small-load low-temperature furnaces of petrochemical refineries, when the ultralow NOx gas burner is used, the ultralow NOx emission gas burner generates an over-standard phenomenon of CO in the low-temperature furnace, the main reason is that in order to realize ultralow NOx emission of the burner, the burner applies a fuel classification technology, one part of fuel gas is combusted in the middle of a fire pan brick and accounts for 20-30% of the fuel proportion, the other part of fuel gas is combusted at the upper end of the outer side of the fire pan brick and accounts for 70-80% of the fuel proportion, but because the load of the burner is small, the furnace temperature is too low, fuel escapes and is incompletely combusted when the fuel gas at the outer side of the fire pan brick is combusted at the upper part of the fire pan brick, and CO is over-standard; in some high-temperature furnaces such as steam superheating furnaces, styrene furnaces and the like, when an ultralow NOx gas burner is used, the phenomenon that a nozzle of an air gun is burnt out due to high-temperature radiation of a hearth occurs.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a flame-retardant, energy-saving and high-temperature furnace which is more stable, does not float and lick the furnace tube, is efficient and can realize ultra-low NO (NO) and solve the defects of the prior art_xThe high-efficiency flame-stabilizing gas burner with ultralow NOx and CO emissions can effectively avoid the influence of high-temperature radiation on the service life of a nozzle.

A high-efficiency flame-stabilizing gas burner with ultralow NOx and CO emission for high and low furnace temperatures comprises a flow-stabilizing fire basin brick, a flow-stabilizing cooling body, a fire basin brick cover, a gas gun assembly and a long-time lighting assembly. The bottom of the steady flow fire basin brick is provided with a combustor cylinder communicated with the interior of the steady flow fire basin brick. One end of the pilot burner penetrates through the bottom of the burner cylinder body and extends into the steady flow fire basin brick. One end of the gas gun component penetrates through the bottom of the combustor cylinder body and extends into the steady flow fire basin brick and out of the steady flow fire basin brick, and the other end of the gas gun component is communicated with the central gas collecting pipe. The side of the combustor cylinder is provided with an air adjusting butterfly valve. The fire pan brick cover is arranged on the lining of the heating furnace and corresponds to the upper part of the steady flow fire pan brick, and the fire pan brick cover is coaxial with the steady flow fire pan brick. The steady flow cooling body is arranged in the middle of the steady flow fire basin brick.

The steady flow fire pan brick is of a hollow structure, and the hollow part is a combustion air channel. The steady flow fire tray brick is cylindrical, and the upper portion lateral surface leanin of steady flow fire tray brick is the splayed with the shrink, circumference evenly distributed is provided with 4 ~ 20 outside rifle recesses of inserting on the lower part lateral surface of steady flow fire tray brick, the upper portion circumference evenly distributed of steady flow fire tray brick is provided with 16 ~ 40 burner ports that link up, the middle part circumference evenly distributed of steady flow fire tray brick medial surface is provided with 16 ~ 40 and the inside recess of fire tray brick unanimous with combustion-supporting wind air current direction, the inside recess of a fire tray brick corresponds a burner port, the part leanin that the lateral surface is higher than the burner port in the steady flow fire tray brick forms the fire tray brick splayed binding off.

The brazier brick cover is cylindrical and its inside cavity, and the lower part circumference evenly distributed of brazier brick cover is provided with the circular flue gas backward flow hole that a plurality of link up, and the inside slope of brazier brick cover medial surface upper portion forms the splayed binding off of brazier brick cover that the angle is α.

In one embodiment, 8-20 outer grooves of the cooling body are uniformly distributed on the outer side surface of the steady flow cooling body in the circumferential direction.

In one embodiment, the gas gun assembly comprises 4-20 gas guns.

Every gas gun includes main air gun and branch air gun, branch air gun sets up on main air gun, the bottom of main air gun is bent 90 and is welded on central gas collecting pipe and be linked together with central gas collecting pipe, combustor barrel bottom is passed in proper order at the top of main air gun, outside is inserted the rifle recess, stretch out outside and insert outside the rifle recess, an outside is inserted the rifle recess and is corresponded a main air gun, main air gun inserts the clearance between the rifle recess with its outside that corresponds and is 3 ~ 5mm, the one end of branch air gun is linked together with main air gun is inside, the other end stretches into in the inside recess of firebrick brick.

Main air gun includes main gun pipe and main shower nozzle, and main shower nozzle sets up the top at main gun pipe, can dismantle between main shower nozzle and the main gun pipe, and the height that highly is higher than main shower nozzle of circular flue gas backward flow hole.

The branch air gun comprises a branch gun barrel and a branch spray head, the branch spray head is arranged at the top of the branch gun barrel, the branch spray head and the branch gun barrel are detachable, the branch spray head is clamped in a groove in the fire pan brick, and the spray head of the pilot burner is located below the branch spray head.

In one embodiment, the total area of the circular flue gas return holes accounts for 20-30% of the area of the air inlet of the combustion air channel.

In one embodiment, the main air gun accounts for 70-80% of the raw material ratio, and the branch air guns account for 20-30% of the raw material ratio.

In one embodiment, the steady flow cone brick is arranged on the top of the combustor cylinder body through a cone brick tray, a bracket is arranged on the cone brick tray, the steady flow cooling body is arranged in the middle in the steady flow cone brick through the bracket and a fixing frame, and the top surface of the steady flow cooling body is flush with the top surface of the steady flow cone brick.

In one embodiment, the bottom of the combustor can is provided with a viewing and igniting hole.

The combustor cylinder body comprises an inner cylinder, a refractory fiber filling layer and an outer cylinder which are arranged from inside to outside in sequence.

In one embodiment, the steady flow fire tray brick is integrally formed.

Advantages and advantageous effects of the invention

The design of the external lance inserting groove and the internal groove of the fire pan brick ensures that the main spray head and the branch spray head are positioned more accurately, the gas injection angle is more accurate, the flame forming is better, and the main spray head and the branch spray head do not float and lick the furnace tube. The main air gun and the branch air guns form corresponding injection inside and outside the steady flow fire basin brick to form staged combustion of fuel and reasonable fuel proportion of the main air gun and the branch air guns, so that the local concentration of flame of a burner is controlled, over-rich and over-lean combustion of the fuel is realized, and low NOx combustion emission is realized. 4 ~ 20 gas guns evenly distributed, during the burning, flame distributes more evenly on the stationary flow fire pan brick to the flame height has been reduced. The invention has the NOx emission value of 80-100 mg/m from the existing burner³Reduced to 30-50 mg/m³And (4) combustion emission of NOx. The invention ensures that the combustion flame is more stable, and obtains the effect that the blue flame which has good and regular flame forming and does not fly licks the furnace tube. The invention improves the heat efficiency of the heating furnace. The design of the fire pan brick cover ensures that the phenomenon of CO exceeding standard does not occur when the burner is used at low temperature, and the service life of the burner is ensured when the burner is used in a high-temperature furnace.

1. The design of the steady flow fire pan brick of the invention is as follows: the flow-stabilizing fire pan brick is integrally formed, so that the forming irregularity after splicing the fire pan bricks and the influence of air leakage at the seams of the fire pan bricks on flame are effectively avoided; an outer lance inserting groove is formed in the outer side of the steady flow fire pan brick, and the gap between the main air lance and the outer lance inserting groove corresponding to the main air lance is 3-5 mm, so that the size between the main air lances is more accurate, and the flame shape is more regular; 16-40 brazier brick inner grooves which are consistent with the direction of air flow are arranged on the inner side surface of the steady flow brazier brick, the brazier brick inner grooves correspond to the combustion holes communicated with the upper part of the steady flow brazier brick one by one, when combustion-supporting air enters the steady flow brazier brick from a combustor cylinder, the brazier brick inner grooves effectively reduce the generation of turbulent air and rotational air, and meanwhile, branch air guns are inserted into the brazier brick inner grooves, so that the positions of the branch air guns are more accurate, and favorable conditions are provided for stable combustion of combustor flames; the design of the eight-character mouth-closed of the fire pan brick, when the flame after combustion is subjected to the eight-character mouth-closed of the fire pan brick, because of the wind pressure effect, part of flame is combusted from the combustion hole to the outer side of the steady flow fire pan brick to form stable basic flame, and a main air gun outside the steady flow fire pan brick is ignited, so that the phenomenon that the flame is out of fire is effectively prevented.

2. The design of the fire pan brick cover of the invention is as follows: the fire pan brick cover isolates the main air guns around the steady flow fire pan brick from the hearth space, thereby effectively avoiding the heat radiation of the high-temperature hearth temperature to the spray head of the main air guns, and the invention can adapt to a high-temperature furnace, and the highest adaptive hearth temperature can reach 1200 ℃. The lower part of the fire basin brick cover is provided with a through circular smoke backflow hole, the design of the splayed closing-in of the fire basin brick cover can effectively gather the fuel gas outside the steady flow fire basin brick, the recovered smoke and the flame in the middle for combustion, and the problems of fuel gas escape outside the fire basin brick and excessive CO in the prior art are solved.

3. The design of the steady flow cooling body of the invention is as follows: the stationary flow cooling body is as the name implies, its effect is exactly the effect of stable flame and reduction flame central temperature, be equipped with 8 ~ 20 cooling body external grooves on the lateral surface of stationary flow cooling body, when combustion-supporting wind enters into the space between stationary flow fire pan brick medial surface and the stationary flow cooling body lateral surface, the inside recess of fire pan brick and the outside recess of cooling body act on the effectual formation that reduces vortex wind and whirl wind simultaneously, its flame stability can be better, the rule, flame does not drift, do not lick the boiler tube. The outer groove of the cooling body effectively increases the contact area between the outer part of the cooling body and the flame, so that the heat radiation absorption area of the outer part of the steady flow cooling body is increased, the central temperature of the flame is effectively reduced, and the generation of NOx is further inhibited.

4. The design of the gas gun component of the invention is as follows: the bottom of each main air gun is directly bent by 90 degrees and welded on the central gas collecting pipe, so that potential safety hazards caused by air leakage of the joint and the hose are reduced.

Drawings

Fig. 1 is a front sectional view of the present invention.

Fig. 2 is a bottom view of the present invention.

Fig. 3 is a top view of the present invention.

Fig. 4 is a top view of the flow stabilizing fire cone brick of the present invention.

Fig. 5 is a sectional view a-a of fig. 4.

FIG. 6 is a top view of the firebrick cover of the present invention.

Fig. 7 is a sectional view B-B of fig. 6.

Fig. 8 is a bottom view of the gas gun assembly of the present invention.

Fig. 9 is a front view of the gas gun assembly of the present invention.

Fig. 10 is a front view of the flow stabilizing cooling body of the present invention.

Fig. 11 is a top view of the flow stabilizing cooling body of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, a full description thereof will be given below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Referring to fig. 1 to 11, a high efficiency flame-stabilized gas burner with ultra-low NOx and CO emissions for high and low furnace temperatures includes a steady flow fire tray brick 1, a steady flow cooling body 2, and a fire tray brick cover 3. The bottom of the steady flow fire basin brick 1 is provided with a combustor cylinder 4 communicated with the interior of the steady flow fire basin brick 1. One end of the pilot burner 5 passes through the bottom of the burner barrel 4 and extends into the steady flow fire basin brick 1. One end of the gas gun assembly 6 penetrates through the bottom of the combustor barrel 4 and extends into the steady flow fire basin brick 1 and out of the steady flow fire basin brick 1, and the other end is communicated with the central gas collecting pipe 7. The side of the combustor cylinder 4 is provided with an air adjusting butterfly valve 8. The fire pan brick cover 3 is arranged on the heating furnace lining 9 and corresponds to the upper part of the steady flow fire pan brick 1, and the fire pan brick cover 3 is coaxial with the steady flow fire pan brick 1. The steady flow cooling body 2 is arranged in the middle of the steady flow fire basin brick 1. The steady flow fire basin brick 1 is integrally formed.

As shown in fig. 1, 4 and 5, the steady flow fire tray brick 1 is of a hollow structure, and the hollow part is a combustion air channel 10.

Specifically, the steady flow fire basin brick 1 is cylindrical, and the outer side surface of the upper part of the steady flow fire basin brick 1 is inwards inclined and contracted to be in a splayed shape. 8 external lance inserting grooves 11 are uniformly distributed on the outer side surface of the lower part of the steady flow fire basin brick 1 in the circumferential direction. The upper portion circumference evenly distributed of stationary flow fire pan brick 1 is provided with 16 burner ports 12 that link up, and the middle part circumference evenly distributed of stationary flow fire pan brick 1 medial surface is provided with 16 and the interior recess 13 of fire pan brick that combustion-supporting wind air current direction is unanimous, and the interior recess 13 of a fire pan brick corresponds a burner port 12. The part of the inner side surface of the steady flow fire tray brick 1, which is higher than the combustion holes 12, is inclined inwards to form a splayed closing-in 14 of the fire tray brick.

Wherein, as shown in fig. 6 and 7, the firebox brick cover 3 is cylindrical and has a hollow interior.

Specifically, the lower part of the brazier brick cover 3 is circumferentially and uniformly distributed with a plurality of through circular smoke return holes 31, and the upper part of the inner side surface of the brazier brick cover 3 is inwards inclined to form a splayed closing-in 32 of the brazier brick cover with an angle of α.

As shown in fig. 10 and 11, 16 cooling body outer grooves 21 are uniformly distributed on the outer side surface of the steady flow cooling body 2 in the circumferential direction.

As shown in fig. 1, 8 and 9, the gas gun assembly 6 includes 8 gas guns.

Specifically, each gas gun comprises a main air gun 61 and a branch air gun 62, and the branch air gun 62 is arranged on the main air gun 61. The bottom of the main air gun 61 is bent by 90 degrees and welded on the central gas collecting pipe 7 and communicated with the central gas collecting pipe 7, and the top of the main air gun 61 sequentially passes through the bottom of the combustor cylinder 4 and the external gun inserting groove 11 and extends out of the external gun inserting groove 11. One outer lance insertion groove 11 corresponds to one main air gun 61, and the gap between the main air gun 61 and the outer lance insertion groove 11 corresponding to the main air gun is 3-5 mm. One end of the branch air gun 62 is communicated with the interior of the main air gun 61, and the other end thereof extends into the groove 13 in the fire pan brick.

Specifically, the main air gun 61 includes a main barrel 611 and a main nozzle 612, the main nozzle 612 is disposed on the top of the main barrel 611, and the main nozzle 612 is detachable from the main barrel 611. The circular flue gas recirculation hole 31 has a height higher than that of the main nozzle 612.

Specifically, the branch air gun 62 includes a branch barrel 621 and a branch spray head 622, the branch spray head 622 is disposed on the top of the branch barrel 621, and the branch spray head 622 is detachable from the branch barrel 621. The branch nozzle 622 is clamped in the groove 13 inside the fire pan brick. The nozzle of the pilot lamp 5 is located below the branch nozzle 622.

Wherein, the total area of the circular smoke return holes 31 accounts for 20-30% of the area of the air inlet of the combustion air channel 10.

Specifically, the main air gun 61 accounts for 70% -80% of the raw material ratio, and the branch air gun 62 accounts for 20% -30% of the raw material ratio.

Wherein, in the material components of the fire pan brick cover 3, by mass percentage, Al₂O₃The content of (A) is greater than or equal to 65%, and the content of steel fibers is 2%.

Specifically, as shown in FIG. 1, the flow stabilizing fire tray brick 1 is disposed on top of the combustor can 4 by a fire tray brick tray 15. The brazier brick tray 15 is provided with a bracket 22, the steady flow cooling body 2 is arranged in the middle of the steady flow brazier brick 1 through the bracket 22 and a fixing frame 23, and the top surface of the steady flow cooling body 2 is flush with the top surface of the steady flow brazier brick 1.

Specifically, as shown in fig. 2, the bottom of the combustor basket 4 is provided with a fire observation hole 41 and an ignition hole 42. As shown in FIG. 1, the combustor casing 4 includes an inner cylinder 43, a refractory fiber-packed layer 44, and an outer cylinder 45, which are arranged in this order from the inside to the outside.

Working principle and working process of the invention

When the branch air guns 62 are ignited by the pilot light 5, a part of the flame of the branch air guns 62 is ejected outwards through the combustion holes 12 and ignites the main air guns 61 outside the steady flow fire pan brick 1, and the fuel of the main air guns 61 is converged with the flame of the branch air guns 62 at the upper end of the steady flow fire pan brick 1 along the inclined plane outside the steady flow fire pan brick 1 to form staged combustion. When the gas in the outside of the steady flow fire pan brick 1 is sprayed upwards and the negative pressure brought by the burner during burning, the smoke in the hearth outside the fire pan brick cover 3 is injected into the flame of the burner (in the fire pan brick cover 3) through the circular smoke backflow hole 31 to be combusted secondarily, so that smoke backflow is formed, and the generation of NOx of the effective further reduction of the technology is realized.

Combustion-supporting air enters the steady flow fire basin brick 1 through the air adjusting butterfly valve 8 through the inside of the combustor cylinder 4, when the combustion-supporting air enters the space between the inner side surface of the steady flow fire basin brick 1 and the outer side surface of the steady flow cooling body 2, the grooves 13 inside the fire basin brick and the grooves 21 outside the cooling body act simultaneously, the generation of turbulent air and rotational air is effectively reduced, the flame stability of the combustion-supporting air is better, and the combustion-supporting air is regular and does not fly and lick the furnace tube.

Advantages and advantageous effects of the invention

1. The invention can realize the combustion of stable flame circular flame, the flame is well formed, the flame is regularly formed, and the flame does not float.

2. The invention can realize high-efficiency flame: the steady flow fire pan brick 1 is integrally formed, and then the accurate positioning of the main air gun 61 and the branch air guns 62 is combined, so that fuel gas and air are uniformly mixed and combusted, blue flame with uniform temperature is formed, the generation of CO is effectively reduced, and efficient combustion flame is formed.

3. The invention has ultra-low NOx emission: the main air gun 61 and the branch air guns 62 are isolated through the steady flow fire pan brick 1 to form staged combustion of fuel, and dense-dilute combustion is formed inside and outside the fire pan brick through reasonable fuel proportion, so that the central temperature of flame is reduced, and NOx generation is inhibited; the external groove 21 of the cooling body increases the absorption area of the heat radiation of the cooling body, so that the steady flow cooling body 2 effectively reduces the central temperature of flame and inhibits the generation of NOx; the flue gas in the hearth outside the fire pan brick cover 3 can be injected and involved in flame combustion along with the fuel gas around the steady flow fire pan brick 1 to form flue gas backflow. The three technologies combine to achieve ultra low NOx emissions from the combustor.

4. The invention can adapt to the temperature of high and low hearths: in a low-temperature hearth, the applicable temperature is 200-600 ℃; by adding the splayed closing-in 32 of the fire pan brick cover, the fuel gas outside the steady flow fire pan brick 1 is gathered to the flame center for combustion, so that the combustion is sufficient, and the generation of CO is avoided. In a high-temperature hearth, the applicable temperature is 800-1200 ℃; through increasing the brazier brick cover 3, the effectual influence of avoiding furnace high temperature radiation to the outside main shower nozzle 612 of stationary flow brazier brick cover 3, the life of effectual protection shower nozzle.

5. The design of the steady flow fire pan brick 1 of the invention is as follows: the flow-stabilizing fire pan brick 1 is integrally formed, so that the forming irregularity after splicing the fire pan bricks and the influence of air leakage at the seams of the fire pan bricks on flame are effectively avoided; the outer side of the steady flow fire pan brick 1 is provided with an outer lance inserting groove 11, and the gap between the main air lance 61 and the outer lance inserting groove 11 corresponding to the main air lance 61 is 3-5 mm, so that the size between the main air lances 61 is more accurate, and the flame shape is more regular; 16-40 brazier brick inner grooves 13 which are consistent with the direction of air flow are arranged on the inner side surface of the steady flow brazier brick 1, the brazier brick inner grooves 13 correspond to the combustion holes 12 which are communicated with the upper part of the steady flow brazier brick 1 one by one, when combustion-supporting air enters the steady flow brazier brick 1 from the combustor cylinder 4, the brazier brick inner grooves 13 effectively reduce the generation of turbulent air and rotational air, and meanwhile, the branch air guns 62 are inserted into the brazier brick inner grooves 13, so that the positions of the branch air guns 62 are more accurate, and favorable conditions are provided for stable combustion of combustor flames; the design of the splayed flame-off port 14 of the fire pan brick ensures that a part of flame is burnt from the burning hole 12 to the outer side of the steady flow fire pan brick 1 due to the wind pressure effect when the burnt flame passes through the splayed flame-off port 14 of the fire pan brick, so as to form stable basic flame, and ignite the main air gun 61 outside the steady flow fire pan brick 1, thereby effectively preventing the flame from taking off fire.

6. The design of the fire pan brick cover 3 of the invention is as follows: the fire pan brick cover 3 isolates the main air guns 61 around the steady flow fire pan brick 1 from the hearth space, effectively avoids the heat radiation of the high-temperature hearth temperature to the main spray heads 612 of the main air guns 61, and ensures that the invention can adapt to a high-temperature furnace, and the maximum adaptive hearth temperature can reach 1200 ℃. The lower part of the fire basin brick cover 3 is provided with a through circular flue gas backflow hole 31, the design of the splayed closing-in 32 of the fire basin brick cover can effectively gather and burn the fuel gas outside the steady flow fire basin brick 1 and the recovered flue gas with the flame in the middle, and the problems of fuel gas escape outside the fire basin brick and excessive CO in the prior art are solved, so that the invention is suitable for a low-temperature furnace, when the fuel gas outside the steady flow fire basin brick 1 is upwards sprayed and the negative pressure is brought when a burner burns, the flue gas around the fire basin brick cover 3 enters the flame of the burner through the circular flue gas backflow hole 31 of the flue gas to carry out secondary combustion, and the technology effectively further reduces the generation of NOx.

7. The design of the steady flow cooling body 2 of the invention: the stationary flow cooling body 2 is as the name implies, its effect is exactly the effect of stable flame and reduction flame central temperature, be equipped with 8 ~ 20 cooling body outside recesses 21 on the lateral surface of stationary flow cooling body 2, when combustion-supporting wind enters into the space between stationary flow fire pan brick 1 medial surface and the 2 lateral surfaces of stationary flow cooling body, the inside recess 13 of fire pan brick and the outside recess 21 of cooling body act on the effectual generation that reduces vortex wind and whirl wind simultaneously, its flame stability can be better, the rule, flame does not waft, do not lick the boiler tube. The external groove 21 of the cooling body effectively increases the contact area between the external part of the cooling body and the flame, so that the external heat radiation absorption area of the steady flow cooling body 2 is increased, the central temperature of the flame is effectively reduced, and the generation of NOx is further inhibited.

8. The design of the gas gun assembly 6 of the present invention: the bottom of each main air gun 61 is directly bent by 90 degrees and welded on the central gas collecting pipe 7, so that potential safety hazards caused by air leakage of a joint and a hose are reduced.

The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the attached drawings.

Claims (8)

1. The tray is provided with a high-efficiency flame-stabilizing gas burner with ultralow NOx and CO emission for high and low furnace temperatures, and is characterized by comprising a steady-flow fire basin brick, a steady-flow cooling body, a fire basin brick cover, a gas gun assembly and a pilot lamp assembly, wherein the bottom of the steady-flow fire basin brick is provided with a burner cylinder body communicated with the interior of the steady-flow fire basin brick;

the steady flow fire tray brick is of a hollow structure, a combustion air channel is formed in the hollow part, the steady flow fire tray brick is cylindrical, the outer side face of the upper part of the steady flow fire tray brick inclines inwards and shrinks to be in a splayed shape, 4-20 external lance inserting grooves are uniformly distributed on the outer side face of the lower part of the steady flow fire tray brick in the circumferential direction, 16-40 through combustion holes are uniformly distributed on the upper part of the steady flow fire tray brick in the circumferential direction, 16-40 fire tray brick internal grooves consistent with the combustion air flow direction are uniformly distributed on the middle part of the inner side face of the steady flow fire tray brick in the circumferential direction, one fire tray brick internal groove corresponds to one combustion hole, and the part of the inner side face of the steady flow fire tray brick, which is higher than the combustion holes, inclines inwards;

the brazier brick cover is cylindrical and its inside cavity, and the lower part circumference evenly distributed of brazier brick cover is provided with the circular flue gas backward flow hole that a plurality of link up, and the inside slope of brazier brick cover medial surface upper portion forms the splayed binding off of brazier brick cover that the angle is α.

2. The ultra-low NOx and CO emission efficient flame-stabilizing gas burner for the high and low furnace temperatures according to claim 1, wherein 8-20 outer grooves of the cooling body are uniformly distributed on the outer side surface of the steady flow cooling body in the circumferential direction.

3. The high and low furnace temperature ultra-low NOx and CO emission high efficiency flame-stabilized gas burner of claim 1, wherein the gas gun assembly comprises 4-20 gas guns;

each gas gun comprises a main gas gun and a branch gas gun, the branch gas guns are arranged on the main gas gun, the bottom of the main gas gun is bent by 90 degrees and welded on the central gas collecting pipe and communicated with the central gas collecting pipe, the top of the main gas gun sequentially penetrates through the bottom of the combustor cylinder body and the external gun inserting grooves and extends out of the external gun inserting grooves, one external gun inserting groove corresponds to one main gas gun, the gap between the main gas gun and the corresponding external gun inserting groove is 3-5 mm, one end of each branch gas gun is communicated with the inside of the main gas gun, and the other end of each branch gas gun extends into the groove in the fire pot brick;

the main air gun comprises a main gun tube and a main spray nozzle, the main spray nozzle is arranged at the top of the main gun tube, the main spray nozzle and the main gun tube are detachable, and the height of the circular flue gas backflow hole is higher than that of the main spray nozzle;

the branch air gun comprises a branch gun barrel and a branch spray head, the branch spray head is arranged at the top of the branch gun barrel, the branch spray head and the branch gun barrel are detachable, the branch spray head is clamped in a groove in the fire pan brick, and the spray head of the pilot burner is located below the branch spray head.

4. The high and low furnace temperature ultra-low NOx and CO emission high efficiency flame-stabilized gas burner of claim 1, wherein the total area of the circular flue gas recirculation holes accounts for 20-30% of the area of the air inlet of the combustion air channel.

5. The high and low furnace temperature ultra-low NOx and CO emission high efficiency flame-stabilized gas burner of claim 3, wherein the main air gun is 70-80% of the raw material ratio, and the branch air gun is 20-30% of the raw material ratio.

6. The high and low furnace temperature ultra-low NOx, CO emitting high efficiency flame stabilized gas burner of claim 1, wherein the steady flow cone block is disposed at the top of the burner barrel by a cone block tray, the cone block having a bracket, the steady flow cooling body is disposed in the middle of the steady flow cone block by the bracket and the fixing frame, and the top surface of the steady flow cooling body is flush with the top surface of the steady flow cone block.

7. The high and low furnace temperature ultra-low NOx, CO emission high efficiency flame stabilized gas burner of claim 1, wherein the bottom of the burner barrel is provided with a flame viewing hole and an ignition hole;

the combustor cylinder body comprises an inner cylinder, a refractory fiber filling layer and an outer cylinder which are arranged from inside to outside in sequence.

8. The high and low furnace temperature ultra-low NOx, CO emission high efficiency flame stabilized gas burner of claim 1, wherein the flow stabilizing fire tray brick is integrally formed.

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