CN201575455U

CN201575455U - Novel high efficiency and low NOx controllable flame-shaped gas burner

Info

Publication number: CN201575455U
Application number: CN2009201642382U
Authority: CN
Inventors: 毛羽; 王娟; 王江云
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-16
Filing date: 2009-07-16
Publication date: 2010-09-08
Anticipated expiration: 2019-07-16

Abstract

A novel gas burner comprises a restricted type fire pan, one or more fuel spray guns and an inlet duct; the cross section of the fire pan can be round, rectangular or elliptical; one or a plurality of uniformly distributed fuel spray guns are arranged in the center of the fire pan; and different numbers of fuel spray orifices are formed on a spray nozzle of each spray gun. Gas and air can be well mixed and burnt in the fire pan of the burner; after a certain distance, the mixture with certain temperature is sprayed into a hearth at a higher speed to flow continuously and burn sufficiently under the action of restraint and guide of the fire pan, so steady, flat, rigid and long flame is formed; and the width, length, direction and position of the flame can be controlled and adjusted according to the requirement of a heating furnace. The utility model can greatly improve the heat transfer efficiency of a radiation chamber and lower the NOx emission remarkably, thereby being suitable for various heating furnaces, in particular to tube-type heating furnaces and cracking furnaces.

Description

A kind of new and effective low NOx controllable flame shape gas burner

Affiliated technical field

Extensively adopt gas burner in petrochemical process, the source of gaseous fuel is a Device in Gas self-produced in the production process.The present invention relates to a kind of New Gas Burner Unit, this burner can produce required flame profile according to arts demand, has the higher thermal efficiency, promptly can produce the retention flame of required form, the shape of flame, width, length, direction and position can be controlled and regulate according to the needs of heating furnace, have the higher thermal efficiency and lower NOx discharging, can be used in the various heating furnaces, particularly tubular heater.

Background technology

Because the structure difference of polytechnic tubular heater, as the boiler tube arrangement mode, heat transfer type, burner position or the like is all different, so to the shape of flame in the burner hearth, temperature be distributed with different requirements.Burners in prior is difficult to generate required flame profile and Temperature Distribution according to arts demand, is difficult to produce higher heat transfer efficiency.

For gas burner, because gas fuel combustion speed is very fast, flame is shorter, is difficult to control the Temperature Distribution in the stove, and it is relatively more difficult to be formed with the temperature field, the raising thermal efficiency of heating furnace that are beneficial to heat transfer in radiation chamber.And the processing medium reaction temperature is higher relatively in the pipe, so bigger in the difficulty of radiation chamber heat transfer of medium in boiler tube.In addition, the load of tubular heater is big, and temperature height in the burner hearth is controlled the improper Air thing that is easy to generate.

No matter vertical stove or horizontal chamber furnace (oven), because gas flame is shorter, the high-temperature region concentrates on the local bottom of boiler tube, and boiler tube is heated inhomogeneous, and local heat flux density is big, and is overheated easily, and all the other positions then heat flow density are lower.The situation influence pockety of this temperature and heat flow density is to the heat transfer of radiation chamber to boiler tube, cause the radiation chamber thermal efficiency low, and cause the boiler tube hot-spot easily, produce local coking, coke cleaning period short (pyrolysis furnace, coking furnace etc.), and influence the boiler tube life-span.These factors have also limited the raising of heating furnace unit volume treating capacity, have increased the cost of unit processing capacity.

Summary of the invention

The present invention proposes a kind of New Gas Burner Unit, the shape in fuel nozzle and fire pot and air channel adapts, fuel can fully mix with air, burner uses restraint and leads mixture and preliminary combustion gas, can under very low coefficient of excess air, fully burn rapidly, can be according to the arrangement mode of arts demand and boiler tube, produce the stable rigidity flame of required form, the shape of flame, width, length, direction and position can be controlled and regulate according to the needs of heating furnace, therefore can control the temperature field in the heating furnace, generation is easy to distribute to the temperature field of furnace tube heat transfer, significantly improves radiant heat transfer efficient, reduces fuel consumption and CO significantly ₂And the discharging of NOx, and can significantly improve the treating capacity of heating furnace.This novel burner is simple in structure, and operating flexibility is big, is easy to make and install, can under 20～130% situations of declared working condition, stablize normal combustion, and can adapt to all gases fuel, can satisfy the needs of various technical process heating furnaces, particularly tubular heater.

The utility model comprises, a kind of New Gas Burner Unit, it is made up of restricted type fire pot, one or more Fuel lance (3) and air intake duct (5), restricted type fire pot wherein is made up of fire pot export orientation section (1), fire pot confinement section (2), fire pot entrance guiding section (4), it is characterized in that fire pot confinement section (2) upper end and smooth linking to each other of fire pot export orientation section (1), lower end and smooth linking to each other of fire pot entrance guiding section (4), fire pot export orientation section (1) upper end extends burner hearth 6, and fire pot entrance guiding section (4) lower end is communicated with air intake duct (5).By the number of adjustment Fuel lance and the cross sectional shape of fire pot, can produce the different flat flame of width.

In the described New Gas Burner Unit, the width of fire pot confinement section (2) is D, and length is L, highly is H, and the scope of its length L is 1.0D～80.0D, and the scope of its height H is 0.2D～10.0D, and its cross section is circle, rectangle, ellipse.

In the described New Gas Burner Unit, the scope of the length L 1 of fire pot export orientation section (1) is 0.5D～85.0D, the scope of the exit width D1 of its upper end is at 0.3D～3.0D, the scope of its height H 1 is at 0.3D～10.0D, the scope of height H 4 that burner hearth is goed deep in its upper end is at 0.1D～20.0D, and its cross section can be circle, rectangle, ellipse.

In the described New Gas Burner Unit, the end opening of fire pot entrance guiding section (4) has certain expansion, the scope of its length L 2 is 0.5D～85.0D, the scope of its lower port diameter D2 is at 0.5D～2.0D, the scope of its height H 2 is at 0.2D～10.0D, and its cross section can be circle, rectangle, ellipse.

In the described New Gas Burner Unit, burning spray gun (3) can have a plurality of spray guns, and the fuel jet orifice of different numbers is arranged on the shower nozzle of each spray gun; Shower nozzle can be positioned at the fire pot center, also can a plurality of equilibriums arrange; When having a plurality of burning spray gun, the scope of spacing b1 between each Fuel lance, b2, b3, b4 etc. is 0.2D～5.0D, the scope of the distance b between each Fuel lance and the sidewall is 0.1D～0.9D, each fuel nozzle can have identical or different fuel quantity, the top of burning spray gun (3) shower nozzle to the scope of the distance H 3 of the bottom of fire pot entrance guiding section (4) at-1.0D～5.0D.

In the described New Gas Burner Unit, can have air door, the elbow of controlling air quantity on the air intake duct (5) and guarantee the parallel rectifier that enters fire pot of air-flow.

Description of drawings

Fig. 1 is the front view of gas burner of the present utility model.

Fig. 2 is the vertical view of gas burner of the present utility model.

Fig. 3 is the side view of gas burner of the present utility model.

Among Fig. 1 and Fig. 3,1. fire pot export orientation section, 2. fire pot confinement section, 3. Fuel lance, 4. fire pot entrance guiding section, 5. air intake duct, 6. burner hearth.

The specific embodiment

Fig. 1, Fig. 2 and Fig. 3 illustrate a kind of New Gas Burner Unit, it is made up of restricted type fire pot, one or more Fuel lance (3) and air intake duct (5), restricted type fire pot wherein is made up of fire pot export orientation section (1), fire pot confinement section (2), fire pot entrance guiding section (4), it is characterized in that fire pot confinement section (2) upper end and smooth linking to each other of fire pot export orientation section (1), lower end and smooth linking to each other of fire pot entrance guiding section (4), fire pot export orientation section (1) upper end extends burner hearth 6, and fire pot entrance guiding section (4) lower end is communicated with air intake duct (5).

With reference to figure 1, Fig. 3, the width of fire pot confinement section (2) is D, and length is L, highly is H, and the scope of its length L is 1.0D～80.0D, and the scope of its height H is 0.2D～10.0D, and its cross section can be circular, square, oval, rectangle, various camber line shape.

With reference to figure 1, Fig. 3, the scope of the length L 1 of fire pot export orientation section (1) is 0.5D～85.0D, the scope of the exit width D1 of its upper end is at 0.3D～3.0D, the scope of its height H 1 is at 0.3D～10.0D, the scope of height H 4 that burner hearth is goed deep in its upper end is at 0.1D～20.0D, and its cross section can be circle, rectangle, ellipse.

With reference to figure 1, Fig. 3, the end opening of fire pot entrance guiding section (4) has certain expansion, and the scope of its length L 2 is 0.5D～85.0D, and the scope of its lower port diameter D2 is at 0.5D～2.0D, the scope of its height H 2 is at 0.2D～10.0D, and its cross section can be circle, rectangle, ellipse.

With reference to figure 1, Fig. 2, Fig. 3, burning spray gun (3) can have a plurality of spray guns, and the fuel jet orifice of different numbers is arranged on the shower nozzle of each spray gun; Shower nozzle can be positioned at the fire pot center, also can a plurality of equilibriums arrange; When having a plurality of burning spray gun, the scope of spacing b1 between each Fuel lance, b2, b3, b4 etc. is 0.2D～5.0D, the scope of the distance b between each Fuel lance and the sidewall is 0.1D～0.9D, each fuel nozzle can have identical or different fuel quantity, the top of burning spray gun (3) shower nozzle to the scope of the distance H 3 of the bottom of fire pot entrance guiding section (4) at-1.0D～5.0D.

With reference to figure 1, Fig. 3, can have air door, the elbow of controlling air quantity on the air intake duct (5) and guarantee the parallel rectifier that enters fire pot of air-flow.

Gas burner use of the present utility model, for example can be, air enters fire pot confinement section (2) by air intake duct (5) and fire pot entrance guiding section (4), gaseous fuel mixes with air by the bottom that Fuel lance (3) sprays into fire pot confinement section (2), because the constraint of fire pot confinement section (2), combustion gas and air be not outwards (burner hearth) diffusion, in the less space of fire pot confinement section (2), fuel can mix preferably with air, behind a segment distance, some fuel combustion heat release, remaining fuel gas burns while mixing with air, and mobile to fire pot export orientation section (1) acceleration, this subsequently mixture with uniform temperature sprays into burner hearth (6) with higher speed.Because in fire pot, fully mix, and the constraint of fire pot and guiding, the mixture fluid moving and fully burning in burner hearth (6) relaying afterflow that enters burner hearth (6) forms the stable long flame of rigidity.The length of flame can be regulated according to the needs of heating furnace technology.This flame can be formed with the Temperature Distribution that is beneficial to furnace tube heat transfer in heating furnace, improve the thermal efficiency of heating furnace.

The burner that the utility model relates to can adopt less coefficient of excess air, and fuel can fully burn, and higher burning and heat transfer efficiency are arranged, and produces very low NOx discharging.The fractional combustion mode that the tradition low NOx combusting technology adopts the classification air inlet or divides progressive fuel, though can reduce generation and the emission level of NOx, efficiency of combustion is lower, has reduced the thermal efficiency of heating furnace.

Numerical simulation calculation and experiment show that this novel burner can fully burn, and forms controlled flat upright and outspoken long flame under the condition of coefficient of excess air 1.01～1.6.Compare with conventional burners, its NOx discharging reduces more than 50%, and can improve thermal efficiency of heating furnace 5%～10%.

Commercial Application at ethane cracking furnace shows, the novel burner that the utility model proposes can significantly improve the thermal efficiency of radiation chamber and whole heating furnace, the fuel of unit processing capacity consumption descends significantly, the amplitude that reduces is more than 8%, the treating capacity of device has improved more than 10%, the NOx discharging that is produced can reach and the same level of import low-NOx combustor that adopts grading combustion technology, even lower.Because fuel consumption significantly reduces, therefore also significantly reduced CO ₂Discharging.Process units has produced bigger economic benefit.

The gas burner that the utility model proposes is applicable to all gases burning heater, is particularly suitable for tubular heater.

Claims

1. New Gas Burner Unit, it is made up of restricted type fire pot, one or more Fuel lance (3) and air intake duct (5), restricted type fire pot wherein is made up of fire pot export orientation section (1), fire pot confinement section (2), fire pot entrance guiding section (4), it is characterized in that fire pot confinement section (2) upper end and smooth linking to each other of fire pot export orientation section (1), lower end and smooth linking to each other of fire pot entrance guiding section (4), fire pot export orientation section (1) upper end extends burner hearth (6), and fire pot entrance guiding section (4) lower end is communicated with air intake duct (5).

2. by the described New Gas Burner Unit of claim 1, it is characterized in that: the width of described fire pot confinement section (2) is D, length is L, highly be H, then the scope of its length L is 1.0D～80.0D, the scope of its height H is 0.2D～10.0D, and its cross section can be circle, rectangle, ellipse.

3. by the described New Gas Burner Unit of claim 1, it is characterized in that: the scope of the length L 1 of described fire pot export orientation section (1) is 0.5D～85.0D, the scope of the exit width D1 of its upper end is at 0.3D～3.0D, the scope of its height H 1 is at 0.3D～10.0D, the scope of height H 4 that burner hearth is goed deep in its upper end is at 0.1D～20.0D, and its cross section can be circle, rectangle, ellipse.

4. by the described New Gas Burner Unit of claim 1, it is characterized in that: the end opening of described fire pot entrance guiding section (4) has certain expansion, the scope of its length L 2 is 0.5D～85.0D, the scope of its lower port diameter D2 is at 0.5D～2.0D, the scope of its height H 2 is at 0.2D～10.0D, and its cross section can be circle, rectangle, ellipse.

5. by the described New Gas Burner Unit of claim 1, it is characterized in that: described burning spray gun (3) can have a plurality of spray guns, and the fuel jet orifice of different numbers is arranged on the shower nozzle of each spray gun; Shower nozzle can be positioned at the fire pot center, also can a plurality of equilibriums arrange; When having a plurality of burning spray gun, the scope of spacing b1 between each Fuel lance, b2, b3, b4 etc. is 0.2D～5.0D, the scope of the distance b between each Fuel lance and the sidewall is 0.1D～0.9D, each fuel nozzle can have identical or different fuel quantity, the top of burning spray gun (3) shower nozzle to the scope of the distance H 3 of the bottom of fire pot entrance guiding section (4) at-1.0D～5.0D.

6. by the described New Gas Burner Unit of claim 1, it is characterized in that: have air door, the elbow of controlling air quantity on the described air intake duct (5) and guarantee the parallel rectifier that enters fire pot of air-flow.