CN111336519A

CN111336519A - Heat accumulating type natural gas direct flame burner

Info

Publication number: CN111336519A
Application number: CN201911216914.0A
Authority: CN
Inventors: 汤成忠; 朱益兵; 陈金华
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-06-26

Abstract

The utility model provides a heat accumulation formula natural gas direct flame nozzle, includes the nozzle body, is equipped with a set of or multiunit gas passage in the nozzle body, and every group gas passage includes gas passage and the combustion-supporting wind passageway that intersects with gas passage. The heat accumulating type natural gas direct flame burner also comprises heat accumulators and natural gas spray guns, wherein the number of the heat accumulators is the same as that of the gas channels. Each heat accumulator is arranged in the combustion-supporting air channel corresponding to the gas channel. Each natural gas spray gun comprises a gun seat and a gun body; the gun seat comprises an annular gun seat body and a gun seat flange connected with one end of the gun seat body, the gun seat body extends into one end of the gas channel, and the gun seat flange is detachably connected with the burner body; the gun body comprises a gun barrel and a gun barrel flange; the barrel flange is connected to the barrel of the barrel and removably connected to the butt flange. And the side surface of the gas channel of each group of gas channels is provided with an ignition gun mounting hole which penetrates through the side wall of the burner body. The natural gas spray gun is easy to maintain and replace and durable in use.

Description

Heat accumulating type natural gas direct flame burner

Technical Field

The invention relates to a gas burner technology for an industrial furnace.

Background

The steel rolling heating furnace, the ladle baking device and the like need to use natural gas direct flame burners. In current natural gas direct flame nozzle, natural gas spray gun and burning torch often set up on same gun stock, in case the gun stock damages, must dismantle natural gas spray gun, burning torch and gun stock simultaneously and change, have brought the inconvenience for maintaining the maintenance. In addition, the existing natural gas direct flame burner has the defects of low combustion efficiency and poor energy-saving effect.

Disclosure of Invention

The invention aims to solve the technical problem of providing a heat accumulating type natural gas direct flame burner, wherein a natural gas spray gun of the heat accumulating type natural gas direct flame burner is easy to maintain and replace and durable in use.

The invention aims to solve the further technical problem of providing the natural gas direct flame burner which is stable and reliable in combustion, high in combustion efficiency and good in energy-saving effect.

The technical scheme adopted by the invention is as follows: the heat accumulating type natural gas direct flame burner comprises a burner body, wherein one group or a plurality of groups of gas channels are arranged in the burner body, and each group of gas channels comprises a gas channel and a combustion-supporting air channel intersected with the gas channel; the heat accumulating type natural gas direct flame burner is characterized by also comprising heat accumulators and natural gas spray guns, wherein the number of the heat accumulators is the same as that of the gas channels; each heat accumulator is arranged in a combustion-supporting air channel corresponding to the gas channel; each natural gas spray gun comprises a gun seat and a gun body; the gun seat comprises an annular gun seat body and a gun seat flange connected with one end of the gun seat body, the gun seat body extends into one end of the gas channel, and the gun seat flange is detachably connected with the burner body; the gun base body comprises a gun base shell and a gun base fireproof heat-insulating layer, and the gun base fireproof heat-insulating layer is poured on the inner wall of the gun base shell; the gun body comprises a gun barrel and a gun barrel flange; the gun barrel flange is connected with the barrel body of the gun barrel and detachably connected with the gun seat flange; the gun barrel is divided into a front section and a rear section by taking the gun barrel flange as a boundary, a fire-resistant heat-insulating layer of the gun barrel is poured on the outer peripheral surface of the front section, and the front section penetrates through the central through hole of the gun seat body and extends into the gas channel; and the side surface of the gas channel of each group of gas channels is provided with an ignition gun mounting hole which penetrates through the side wall of the burner body.

In the heat accumulating type natural gas direct flame burner, each gas channel sequentially comprises a guide section, a mixing section and a flame jet from one end of the gas channel to the other end of the gas channel; the combustion-supporting air channel is intersected with the guide section, and the front section of a gun barrel of the natural gas spray gun extends into the guide section; one end of the guide section, which is close to the mixing section, is provided with a conical part, and the diameter of the conical part is gradually reduced from one end of the gas channel to the other end of the gas channel; the mixing section is cylindrical; the flame ports are conical, and the diameters of the flame ports gradually increase from one end of the gas channel to the other end of the gas channel.

The length of the flame spraying opening is 3-3.4 times of the length of the mixing section, and the length of the conical part is 1.1-1.2 times of the length of the mixing section.

Above-mentioned heat accumulation formula natural gas direct flame nozzle, wherein, the material of barrel is heat-resisting stainless steel.

Because the invention adopts the technical scheme, the technical effects are obvious:

1. according to the natural gas direct flame burner disclosed by the embodiment of the invention, the mounting hole of the ignition gun is formed in the side wall of the burner body, so that the natural gas spray gun and the ignition gun are independently mounted, the natural gas spray gun is composed of the gun seat and the gun body which are detachably connected, and the gun seat and the burner body are also detachably connected, so that the gun seat and the gun body are very convenient to replace; meanwhile, the inner wall of the gun seat body and the outer wall of the gun barrel are both cast with fire-resistant heat-insulating layers, and the gun barrel is made of heat-resistant stainless steel, so that the gun seat and the gun body are ensured to be subjected to high temperature and are not easy to damage, and the gun seat has longer service life;

2. the guide section of the gas channel is provided with a conical part at one end close to the mixing section, the diameter of the conical part is gradually reduced from one end of the gas channel to the other end of the gas channel, the mixing section is cylindrical, the flame-throwing port is conical, the diameter of the flame-throwing port is gradually increased from one end of the gas channel to the other end of the gas channel, the length of the flame-throwing port is 3-3.4 times of the length of the mixing section, the length of the conical part is 1.1-1.2 times of the length of the mixing section, the speed of gas sprayed from a gun barrel and air flowing from the combustion-supporting air channel to the mixing section can be accelerated by the conical part of the flame-throwing port, and the gas and the air are fully mixed in the cylindrical mixing section, so that flame sprayed from the flame-throwing port can be fully combusted, the combustion efficiency is improved, and a good energy-saving effect is achieved.

Drawings

Fig. 1 to 3 show a schematic front view, a schematic top view and a schematic side view of a natural gas direct flame burner according to a first embodiment of the invention.

Fig. 4 shows a cross-sectional view a-a of fig. 1.

Fig. 5 shows a cross-sectional view B-B of fig. 2.

Fig. 6 to 8 show a schematic front view, a schematic top view and a schematic side view of a natural gas direct flame burner according to a second embodiment of the invention.

Fig. 9 shows a cross-sectional view a-a of fig. 6.

Fig. 10 shows a cross-sectional view B-B of fig. 7.

Detailed Description

The features and properties of the invention are further elucidated with reference to the figures and embodiments.

Please refer to fig. 1 to 5. The heat accumulating type natural gas direct flame burner comprises a burner body 1, a heat accumulator 2, a natural gas spray gun 3 and a fan cover 4.

The burner body 1 consists of a shell 1a and a burner body fireproof heat-insulating layer 1b poured on the inner wall of the shell. A group of gas channels 10 are arranged in the burner body 1, and the gas channels comprise a gas channel 11 and a combustion-supporting air channel 12 intersected with the gas channel 11. In the embodiment, the burner body 1 is L-shaped, the L-shaped burner body comprises a horizontal part 15 and a vertical part 16, and the combustion air channel 12 is vertically intersected with the gas channel 11.

The heat accumulator 2 is disposed in the combustion air passage 12. In this embodiment, the side wall of the combustion air passage 12 is provided with a support step 121, and the heat accumulator 2 is placed on the support step 121. The heat accumulator 2 is composed of a plurality of pieces of zirconium corundum mullite with holes, and the holes are in a honeycomb shape.

The natural gas injection lance 3 includes a lance base 3a and a lance body 3 b. The gun seat 3a includes an annular gun seat body 31 and a gun seat flange 32 connected to one end of the gun seat body 31, the gun seat body 31 extends into one end of the gas channel 11, and the gun seat flange 32 is detachably connected to the burner body 1. The gun base body 31 includes a gun base housing 311 and a fire-resistant insulation layer 312 of gun base, and the fire-resistant insulation layer 312 of gun base is poured on the inner wall of the gun base housing 311.

The gun body 3b includes a barrel 33 and a barrel flange 34. A barrel flange 34 is connected to the barrel of barrel 33 and is removably connected to the butt flange 32. The barrel 33 is divided into a front section 331 and a rear section 333 by a barrel flange 34, a barrel fire-resistant insulating layer 332 is cast on the outer peripheral surface of the front section 331, and the front section 331 penetrates through the central through hole of the gun seat body 31 and extends into the gas channel 11.

In the embodiment, the burner body 1 is welded with a plurality of first bolts 51, and each first bolt 51 passes through the gun seat flange 32 and is fastened through a first nut 53, so that the gun seat flange 32 is detachably connected with the burner body 1; the gun platform body 31 is welded with a plurality of second bolts 52, and each second bolt 52 passes through the gun platform flange 32 and the barrel flange 34 in turn and is fastened by a second nut 54, so that the barrel flange 34 and the gun platform flange 32 are detachably connected together.

The fan housing 4 is disposed at the air inlet of the combustion air passage 12, and is detachably connected to the burner body 1 by a plurality of third bolts 55. The fan housing 4 is used for communicating with an external air pipe.

An ignition gun mounting hole 13 penetrating through the side wall of the burner body is formed in the side face of the gas channel 11, the ignition gun mounting hole 13 is an inclined hole and used for mounting an ignition gun, and an outlet of the ignition gun mounting hole 13 is close to a gun barrel muzzle in the gas channel.

Further, the gas channel 11 includes a guide section 111, a mixing section 112, and a burner 113 in order from one end of the gas channel to the other end of the gas channel.

The combustion air passage 12 intersects the guide section 111, and the front section 331 of the barrel 33 of the natural gas injection lance extends into the guide section 111. One end of the guide section 111 close to the mixing section 112 is provided with a tapered portion 114, and the diameter of the tapered portion 114 is gradually reduced from one end of the gas channel to the other end of the gas channel. The mixing section 112 is cylindrical. The burner 113 is tapered, and the diameter of the burner 113 gradually increases from one end of the gas passage to the other end of the gas passage.

Further, the length of the flame ports is 3 to 3.4 times the length of the mixing section 112, and the length of the tapered portion 114 is 1.1 to 1.2 times the length of the mixing section 112.

The tapered part of throat can accelerate from the speed that barrel spun gas and the air flow that flows in from combustion-supporting wind passageway flowed into the mixing section, and both obtain abundant mixture at columniform mixing section to enable flame port spun flame to obtain abundant burning, improved combustion efficiency, and reach good energy-conserving effect.

Optionally, the material of the burner body fire-resistant insulation layer 1b is cement, and the material of the gun base fire-resistant insulation layer 312 and the material of the gun barrel fire-resistant insulation layer 332 are both zirconia alumina.

The working process of the regenerative natural gas direct flame burner according to the first embodiment of the invention consists of a combustion stage and an exhaust stage which are continuously cycled. In the combustion stage, the blower blows cold air into the combustion air channel 12 from the air cover 4, and meanwhile, the gun tube 33 of the natural gas spray gun 1 introduces natural gas with the pressure of 7-10KPa into the gas channel 11 and ignites the ignition gun to realize combustion. After a predetermined time (for example 50s), the blower stops working, and the natural gas supply is stopped, and the exhaust stage is started. In the exhaust stage, an external induced draft fan exhausts air through the fan cover 4. In the process of discharging the high-temperature flue gas, the heat accumulator 2 absorbs and stores the waste heat in the high-temperature flue gas. In the next combustion stage, the cold air blown into the combustion-supporting air channel 12 can absorb the heat stored in the heat accumulator 2 when passing through the heat accumulator to realize preheating, so that the gas consumption can be reduced, and the energy-saving effect is achieved.

Fig. 6 to 10 each show a natural gas direct flame burner of a second embodiment of the invention, which differs from the first embodiment mainly in that two sets of gas passages 10 are provided in the burner body 1, and the two sets of gas passages 10 are parallel to each other in the second embodiment. The heat accumulating type natural gas direct flame burner comprises two heat accumulators 2, two natural gas spray guns 3 and two fan covers 4, wherein the number of the two heat accumulators is the same as that of the gas channels 10. Each heat accumulator 2 is disposed in the combustion air passage 12 corresponding to the gas passage. Each natural gas injection lance 3 is provided at one end of the gas passage 11 corresponding to the gas passage. And the side surface of the gas channel 11 of each group of gas channels is provided with an ignition gun mounting hole 13 penetrating through the side wall of the burner body. Each fan cover 4 is arranged at the air inlet of the combustion-supporting air channel 12 corresponding to the gas channel and is detachably connected with the burner body 1. The structure of each gas passage 10, the structure of each heat storage body 2, the structure of each natural gas injection lance 3, and the structure of each hood 4 in the second embodiment are the same as those in the first embodiment.

Furthermore, the burner body 1 is provided with a blocking part 18, and the blocking part 18 is arranged between the other ends (namely, flame ports) of the gas channels of the two groups of gas channels to prevent the flame of the two groups of gas channels from interfering with each other. The barrier is made of refractory heat-insulating material.

The working process of the regenerative natural gas direct flame burner according to the second embodiment of the invention consists of a first working stage and a second working stage which are continuously cycled. In the first working stage, the blower blows cold air into the combustion air channel 12 of one of the air channels, the gun tube 33 of the natural gas spray gun 3 introduces natural gas with the pressure of 7-10KPa into the gas channel 11 of the air channel, and the ignition gun is ignited to realize combustion. Meanwhile, the induced draft fan exhausts air from the combustion air channel 12 of the other air channel, and the exhaust temperature is about 150-200 ℃. In the process of discharging the high-temperature flue gas, the heat accumulator 2 in the combustion-supporting air channel 12 of the other air channel absorbs and stores the waste heat in the high-temperature flue gas. After a predetermined time (e.g. 50s) has elapsed, the first operating phase ends and the second operating phase is entered. In the second operating phase, the combustion air channel 12 of the other air channel is supplied with air and the combustion air channel 12 of said one air channel is discharged with air. Because the cold air blown into the combustion-supporting air channel 12 of the other air channel can absorb the heat stored by the heat accumulator 2 when passing through the heat accumulator, the preheating is realized (the temperature of the preheated hot air can reach 800-1000 ℃), the gas consumption can be reduced, and the energy-saving effect is achieved.

According to the natural gas direct flame burner disclosed by the embodiment of the invention, the mounting hole of the ignition gun is formed in the side wall of the burner body, so that the natural gas spray gun and the ignition gun are independently mounted, the natural gas spray gun is composed of the gun seat and the gun body which are detachably connected, and the gun seat and the burner body are also detachably connected, so that the gun seat and the gun body are very convenient to replace; simultaneously, all pour into a mould fire-resistant heat preservation on the inner wall of stock body and the outer wall of barrel, the barrel adopts heat-resisting stainless steel to make, can ensure that stock and the rifle body stand high temperature and not fragile.

Claims

1. A heat accumulating type natural gas direct flame burner comprises a burner body, wherein one group or a plurality of groups of gas channels are arranged in the burner body, and each group of gas channels comprises a gas channel and a combustion-supporting air channel intersected with the gas channel; the heat accumulating type natural gas direct flame burner is characterized by further comprising heat accumulators and natural gas spray guns, wherein the number of the heat accumulators is the same as that of the gas channels;

each heat accumulator is arranged in a combustion-supporting air channel corresponding to the gas channel;

each natural gas spray gun comprises a gun seat and a gun body; the gun seat comprises an annular gun seat body and a gun seat flange connected with one end of the gun seat body, the gun seat body extends into one end of the gas channel, and the gun seat flange is detachably connected with the burner body; the gun base body comprises a gun base shell and a gun base fireproof heat-insulating layer, and the gun base fireproof heat-insulating layer is poured on the inner wall of the gun base shell; the gun body comprises a gun barrel and a gun barrel flange; the gun barrel flange is connected with the barrel body of the gun barrel and detachably connected with the gun seat flange; the gun barrel is divided into a front section and a rear section by taking the gun barrel flange as a boundary, a fire-resistant heat-insulating layer of the gun barrel is poured on the outer peripheral surface of the front section, and the front section penetrates through the central through hole of the gun seat body and extends into the gas channel;

and the side surface of the gas channel of each group of gas channels is provided with an ignition gun mounting hole which penetrates through the side wall of the burner body.

2. A regenerative natural gas direct flame burner as claimed in claim 1, wherein the firing gun mounting hole is an inclined hole.

3. A regenerative natural gas direct flame burner according to claim 1, wherein each of the gas passages comprises a guide section, a mixing section and a flame jet in sequence from one end of the gas passage to the other end of the gas passage;

the combustion-supporting air channel is intersected with the guide section, and the front section of a gun barrel of the natural gas spray gun extends into the guide section; one end of the guide section, which is close to the mixing section, is provided with a conical part, and the diameter of the conical part is gradually reduced from one end of the gas channel to the other end of the gas channel;

the mixing section is cylindrical; the flame ports are conical, and the diameters of the flame ports are gradually increased from one end of the gas channel to the other end of the gas channel.

4. A regenerative natural gas direct flame burner as set forth in claim 3 wherein said burner has a length 3 to 3.4 times the length of said mixing section and said tapered portion has a length 1.1 to 1.2 times the length of said mixing section.

5. A regenerative natural gas direct flame burner as claimed in claim 1, wherein the burner body is L-shaped, the L-shaped burner body comprising a horizontal portion and a vertical portion;

the combustion-supporting air channel is vertically intersected with the fuel gas channel.

6. A regenerative natural gas direct flame burner as claimed in claim 1, wherein the barrel is made of heat resistant stainless steel.

7. A regenerative natural gas direct flame burner as recited in claim 1 wherein a plurality of first bolts are welded to said burner body, each of said first bolts passing through said gun mount flange and being fastened by a first nut;

the gun seat body is welded with a plurality of second bolts, and each second bolt sequentially penetrates through the gun seat flange and the gun barrel flange and is fastened through a second nut.

8. A regenerative natural gas direct flame burner according to claim 1, further comprising wind hoods in the same number as the gas passages; each fan cover is arranged at the air inlet of the combustion-supporting air passage corresponding to the gas passage and is detachably connected with the burner body.

9. A regenerative natural gas direct flame burner according to any of claims 1 to 8, wherein the number of the gas channels is two groups, and the two groups of gas channels are parallel to each other.

10. A regenerative natural gas direct flame burner as claimed in claim 9, wherein the burner body is provided with a blocking portion, the blocking portion is disposed between the other ends of the gas passages of the two groups of gas passages, and the blocking portion is made of a refractory heat-insulating material.