CN215259783U

CN215259783U - Gas burner system

Info

Publication number: CN215259783U
Application number: CN202121565378.8U
Authority: CN
Inventors: 刘永才; 陈令清; 刘刚
Original assignee: Shenzhen Jiayuntong Electronics Co Ltd
Current assignee: Shenzhen Jiayuntong Electronics Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-12-21
Anticipated expiration: 2031-07-09

Abstract

The utility model discloses a gas burner system. The gas burner system comprises: the device comprises an air supply channel, a flue gas backflow mixing cylinder, an inner cylinder, a bluff body, a 1 st fuel supply system and a 2 nd fuel supply system; the air supply duct comprises an air outlet cylinder; the flue gas backflow mixing cylinder is sleeved outside the air outlet cylinder, and a flue gas backflow channel is formed by a channel between the flue gas backflow mixing cylinder and the air outlet cylinder; the inner cylinder is sleeved in the air outlet cylinder, and an air nozzle is formed by a channel between the inner cylinder and the air outlet cylinder; the bluff body is arranged at the downstream of the inner cylinder; the 1 st fuel supply system is arranged in the air supply channel and comprises two groups of branch pipes which are respectively positioned inside and outside the inner cylinder, and the tail ends of the two groups of branch pipes are respectively connected with an inner support nozzle and an outer support nozzle; the 2 nd fuel supply system is arranged outside the air supply duct and comprises two groups of outer nozzles which spray fuel towards the center at different angles. The utility model discloses mix together gas and inert combustion products before the burning takes place, the peak temperature of greatly reduced composition to inhibit the formation of NOx in the industrial gas combustor.

Description

Gas burner system

Technical Field

The utility model relates to a combustor technical field, concretely relates to gas burner system.

Background

National environmental protection policy is becoming stricter and the requirement for boiler nitrogen oxide emission is becoming higher and higher. For combustion of fuel gases, the mechanism of formation of NOx is primarily of the thermodynamic type, i.e. when the flame temperature is high enough, the covalent bond of N2 is broken to obtain free N ions, which combine with oxygen atoms to form NOx.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide a gas burner system for mixing together gas and inert combustion products before combustion takes place by technical means, which greatly reduces the peak temperature of the composition, thereby suppressing the generation of NOx in industrial gas burners.

In order to realize the purpose of the utility model, the utility model adopts the technical scheme that:

a gas burner system, comprising:

the air supply duct is composed of a large-caliber air duct, a reduced pipe with a contracted caliber and a small-caliber air outlet duct, wherein the large end of the reduced pipe is connected with the air duct, and the small end of the reduced pipe is connected with the air outlet duct;

the flue gas backflow mixing cylinder is sleeved outside the air outlet cylinder and consists of a backflow part with a contracted caliber, a throat part with a small caliber and a diffuser with an expanded caliber, the upstream of the throat part is connected with the outlet of the backflow part, and the downstream of the throat part is connected with the inlet of the diffuser; a flue gas backflow channel is formed by a channel between the flue gas backflow mixing cylinder and the air outlet cylinder;

the inner cylinder is hollow and is sleeved in the air outlet cylinder; a channel between the inner cylinder and the air outlet cylinder forms an air nozzle;

a bluff body disposed downstream of the inner barrel;

the 1 st fuel supply system is arranged in the air supply channel and comprises a main pipe and two groups of branch pipes connected to the downstream of the main pipe, wherein the two groups of branch pipes comprise an inner branch pipe entering the inner cylinder and an outer branch pipe entering the outer part of the inner cylinder and the inner part of the flue gas backflow mixing cylinder, the tail end of the inner branch pipe is connected with an inner branch nozzle, an injection pipe is sleeved outside the inner branch nozzle, and the tail end of the outer branch pipe is connected with an outer branch nozzle;

the 2 nd fuel supply system is arranged outside the air supply duct and comprises an air collecting bag, the air collecting bag is connected with a plurality of external nozzles through branch pipes, and the external nozzles at least partially surround the flue gas backflow mixing cylinder; the outer nozzles are divided into two groups, wherein the injection ports of the outer nozzles of the first group are oriented to inject fuel to the central direction at a first angle relative to the longitudinal axis of the air supply duct, the injection ports of the outer nozzles of the second group are oriented to inject fuel to the central direction at a second angle relative to the longitudinal axis of the air supply duct, and the first angle is not equal to the second angle.

Optionally, the inner cylinder is composed of a large-caliber straight cylinder section, a caliber-contracted necking section, a small-caliber throat and a caliber-expanded flaring section, the large end of the necking section is connected with the straight cylinder section, the small end of the necking section is connected with the small-caliber throat, and the outlet of the small-caliber throat is connected with the small end of the flaring section.

Optionally, the outlet of the air outlet cylinder is not more than the outlet of the backflow part.

Optionally, the position of the spray hole of the outer support nozzle exceeds the outlet of the throat part of the flue gas backflow mixing cylinder.

Optionally, the overall shape of the blunt body is wide in the front and narrow in the rear, and the wide end faces the inner cylinder.

Optionally, the blunt body is hollow, and the outer wall surface is streamlined.

Optionally, the ejection outlet direction of each ejection pipe and the longitudinal axis of the air supply duct form an angle which is radially outward, and the angle range is 0-80 degrees.

Optionally, two sets of external nozzles of the 2 nd fuel supply system surround the flue gas backflow mixing cylinder, the second set of external nozzles are arranged on the periphery of the first set of external nozzles, and the two sets of external nozzles are respectively and uniformly distributed outside the flue gas backflow mixing cylinder in the circumferential direction.

Optionally, the angle between the injection ports of the first group of outer nozzles of the 2 nd fuel supply system and the longitudinal axis of the air supply duct is 0-15 °; the jet ports of the second group of outer nozzles form an angle of 5-20 degrees with the longitudinal axis of the air supply duct.

According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:

1. the mixing of air and inert combustion products in the smoke and the mixing of fuel gas and the inert combustion products are respectively completed before combustion, so that the flame peak value can be greatly reduced, the emission of nitrogen oxides is effectively reduced, and compared with the smoke external circulation technology, the performance of the combustor in the aspects of flame length, regulation ratio and stability is not sacrificed.

2. The central flame stabilizing zone adopts lean premixed combustion, so that the stability of combustion is ensured, the flame peak value can be reduced, and the generation of nitrogen oxides is effectively inhibited.

3. The utility model discloses can further provide 10:1 to 20:1 regulation ratio.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment and the prior art will be briefly described below.

Fig. 1 is a cross-sectional view of a gas burner system according to an embodiment of the present invention;

fig. 2 is a perspective view of a gas burner system according to an embodiment of the present invention;

fig. 3 is a front view of a gas burner system according to an embodiment of the present invention;

fig. 4 is a schematic working diagram of a gas burner system according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. In addition, the terms "inlet", "outlet", "upstream", "downstream" are defined in terms of the direction of gas flow.

The following are detailed descriptions of the respective embodiments.

Referring to fig. 1 to 4, an embodiment of the present invention provides a gas burner system.

The gas burner system includes: an air supply duct 110, a flue gas reflux mixing cylinder 140, an inner cylinder 150, a bluff body 160, a 1 st fuel supply system 120, and a 2 nd fuel supply system 130.

The air supply duct 110 is composed of a large-caliber wind cylinder 111, a reduced pipe 112 with a contracted caliber and a small-caliber wind cylinder 113, wherein the large end of the reduced pipe 112 is connected with the wind cylinder 111, and the small end is connected with the wind cylinder 113.

The flue gas backflow mixing cylinder 140 is composed of a backflow part 141 with a contracted caliber, a throat part 142 with a small caliber and a diffuser 143 with an expanded caliber, the upstream of the throat part 142 is connected with the outlet of the backflow part 141, and the downstream of the throat part is connected with the inlet of the diffuser 143; the flue gas reflux mixing cylinder 140 is sleeved outside the air outlet cylinder 113 of the air supply duct 110; the outlet of the air outlet cylinder 113 does not exceed the outlet of the return part 141, and is preferably flush with the outlet of the return part 141; the channel formed between the flue gas reflux mixing cylinder 140 and the air outlet cylinder 113 of the air supply duct 110 is a flue gas reflux channel.

The inner cylinder 150 is composed of a large-caliber straight cylinder section 151, a caliber-contracted necking section 152, a small-caliber throat 153 and a caliber-expanded flaring section 154, wherein the large end of the necking section 152 is connected with the straight cylinder section 151, the small end of the necking section is connected with the small-caliber throat 153, and the outlet of the small-caliber throat 153 is connected with the small end of the flaring section 154. The inner cylinder 150 is hollow and sleeved in the air outlet cylinder 113 of the air supply duct 110, and the outlet of the inner cylinder exceeds the throat 142 of the flue gas reflux mixing cylinder 140. The passage between the inner cylinder 150 and the outlet cylinder 113 constitutes an air nozzle.

The bluff body 160 is wide in front and narrow in back, one wide end faces the inner cylinder 150, the middle of the bluff body is hollow, the outer wall surface is in a streamline shape similar to a wing, and the bluff body is placed at the downstream of the inner cylinder 150.

A 1 st fuel supply system 120, which is disposed inside the air supply duct 110, supplies fuel to the central flame, and is composed of a main pipe 121, two sets of branch pipes, and nozzles; downstream of the main pipe 121 there are connected two sets of branch pipes, 3 each, namely 3 inner branch pipes 122 and 3 outer branch pipes 124. The inner branch pipe 122 enters the inner cylinder 150, the outer branch pipe 124 enters the outer part of the inner cylinder 150 and the flue gas flows back into the mixing cylinder 140. The ends of the two groups of branch pipes are respectively connected with a nozzle, the end of the inner branch pipe 122 is connected with an inner support nozzle 123, and the end of the outer branch pipe 124 is connected with an outer support nozzle 125. The spray holes of the outer support nozzle 125 are positioned beyond the outlet of the throat 142 of the flue gas recirculation mixing drum 140 in a radially outward direction. Each inner support nozzle 123 is externally sleeved with an injection pipe 126, the side surface of each injection pipe 126 is provided with an opening for air inlet, the direction of the injection outlet of each injection pipe 126 and the longitudinal axis of the air supply duct 110 form a certain angle which is radially outward, the angle range is 0-80 degrees, the preferred angle range is 10-45 degrees, and the further preferred angle range is 15-30 degrees.

The 2 nd fuel supply system 130 is configured outside the air supply duct 110 and comprises an air collecting bag 131, a branch pipe 132 and two groups of external nozzles 133, wherein the air collecting bag 131 is connected with a series of external nozzles 133 arranged outside the flue gas backflow mixing cylinder 140 through the branch pipe 132, and the two groups of external nozzles are uniformly distributed outside the flue gas backflow mixing cylinder 140 in the circumferential direction. Among them, it is preferable that the second group of external nozzles 133b is at the periphery of the first group of external nozzles 133 a. The injection ports of the first set of outer nozzles 133a are oriented to inject fuel toward the center at a first angle with respect to the longitudinal axis of the air supply duct 110; the injection ports of the second set of outer nozzles 133b are oriented to inject fuel toward the center at a second angle with respect to the longitudinal axis of the air supply duct 110, the first angle being unequal to the second angle. The first angle is, for example, between 0-15, preferably between 0-10, and the second angle is, for example, between 5-20, preferably between 8-15, so that the two sets of outer nozzles 9133 are fired at different angles in a central direction.

The embodiment of the utility model provides a still provide the working method of gas burner system as above, include:

a) combustion air is supplied through the air supply duct 110, most of the combustion air (about 55-80% by volume) passes through the air nozzles, and a small part of the combustion air (about 20-45% by volume) passes through the inner cylinder 150; high-speed combustion air passing through the air nozzle forms a low-pressure area in the flue gas backflow mixing cylinder 140 to suck inert combustion products in the hearth through the flue gas backflow channel, and the combustion air and the inert combustion products are primarily mixed in the throat 142;

b) a small part (the volume ratio is about 15-40%) of the gas quantity required by the gas burner system is supplied through the 1 st fuel supply system 120, wherein a part (10-15%) of the gas is sprayed into the ejector pipe 126 through the inner branch nozzle 123 on the inner branch pipe 122, mixed with combustion-supporting air sucked from the inner cylinder 150 and combusted in the ejector pipe 126, and the flame is sprayed out through the outlet of the ejector pipe 126 to form stable flame due to the blocking of the blunt body 160; wherein another part of the fuel gas (the volume ratio is about 10-20%) is sprayed into the flue gas backflow mixing cylinder 140 through the outer nozzle 125 on the outer branch pipe 124 and is combusted with the air mixed with the inert combustion products in the diffuser 143 of the flue gas backflow mixing cylinder 140;

c) supplying a majority (about 60-85% by volume) of the amount of gas required by the gas burner system through the 2 nd fuel supply system 130, wherein a portion of the gas is injected from the first set of outer nozzles 133a at a first angle toward the main combustion zone and another portion of the gas is injected from the second set of outer nozzles 133b at a second angle toward the main combustion zone; these high velocity gas jets formed by the injection will cause the inert combustion products in the furnace to follow and mix with the combustion products prior to entering the combustion zone for combustion.

The embodiment of the utility model provides a nitrogen reduction principle of gas burner system does:

after the combustion air passes through the air nozzle at a high speed, a low-pressure area is formed in the flue gas backflow mixing cylinder 140, so that inert combustion products in the hearth are sucked through the flue gas backflow channel, and the combustion air and the inert combustion products are preliminarily mixed in the throat portion 142. The gas sprayed by the outer branch pipe 124 and the outer branch nozzle 125 and the combustion air mixed with inert combustion products are combusted in the diffusion part 143 of the flue gas backflow mixing cylinder 140, so that the flame peak value in the area can be greatly reduced, and the emission of nitrogen oxides can be effectively reduced.

The high-speed gas jet flow supplied by the No. 2 fuel supply system 130 can drive inert combustion products in the hearth to follow and mix with the inert combustion products before entering the main combustion zone for combustion, so that the flame peak value of the main combustion zone can be greatly reduced, and the emission of nitrogen oxides is effectively reduced.

The gas (about 10-15 vol.%) supplied through the inner branch pipe 122 is mixed with the combustion air (about 20-45 vol.%) sucked into the inner tube 150 for combustion, and the combustion of the central flame is lean premixed combustion, so that the combustion temperature is low.

To sum up, the embodiment of the utility model discloses a gas burner system. According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:

The technical solution of the present invention has been described in detail through the specific embodiments. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same. The technical solutions described in the above embodiments can be modified or part of the technical features can be equivalently replaced by those skilled in the art; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A gas burner system, comprising:

the air supply duct (110) is composed of a large-caliber air duct (111), a reduced pipe (112) with a contracted caliber and a small-caliber air outlet duct (113), the large end of the reduced pipe (112) is connected with the air duct (111), and the small end of the reduced pipe is connected with the air outlet duct (113);

the flue gas backflow mixing cylinder (140) is sleeved outside the air outlet cylinder (113) and consists of a backflow part (141) with a contracted caliber, a throat part (142) with a small caliber and a diffuser (143) with an expanded caliber, the upstream of the throat part (142) is connected with the outlet of the backflow part (141), and the downstream of the throat part is connected with the inlet of the diffuser (143); a flue gas backflow channel is formed by a channel between the flue gas backflow mixing cylinder (140) and the air outlet cylinder (113);

the inner cylinder (150) is hollow and sleeved in the air outlet cylinder (113); a channel between the inner barrel (150) and the air outlet barrel (113) forms an air nozzle;

a bluff body (160) disposed downstream of the inner barrel (150);

the 1 st fuel supply system (120) is arranged in the air supply duct (110) and comprises a main pipe (121) and two groups of branch pipes connected to the downstream of the main pipe (121), the two groups of branch pipes comprise an inner branch pipe (122) entering the inner barrel (150) and an outer branch pipe (124) entering the outer part of the inner barrel (150) and the inner part of the flue gas backflow mixing barrel (140), the tail end of the inner branch pipe (122) is connected with an inner branch nozzle (123), an injection pipe (126) is sleeved outside the inner branch nozzle (123), and the tail end of the outer branch pipe (124) is connected with an outer branch nozzle (125);

the 2 nd fuel supply system (130) is arranged outside the air supply duct (110) and comprises an air collecting bag (131), the air collecting bag (131) is connected with a plurality of external nozzles (133) through branch pipes (132), and the external nozzles (133) at least partially surround the flue gas backflow mixing cylinder (140); the outer nozzles (133) are divided into two groups, wherein the injection ports of the outer nozzles (133a) of the first group are oriented to inject fuel towards the central direction at a first angle relative to the longitudinal axis of the air supply duct (110), and the injection ports of the outer nozzles (133b) of the second group are oriented to inject fuel towards the central direction at a second angle relative to the longitudinal axis of the air supply duct (110), and the first angle is not equal to the second angle.

2. The gas burner system of claim 1, wherein the inner barrel (150) is composed of a straight barrel section (151) with a large caliber, a reducing section (152) with a contracted caliber, a small caliber throat (153) and an expanding section (154) with an expanded caliber, the large end of the reducing section (152) is connected with the straight barrel section (151), the small end is connected with the small caliber throat (153), and the outlet of the small caliber throat (153) is connected with the small end of the expanding section (154).

3. Gas burner system according to claim 1, characterized in that the outlet of the chimney (113) does not exceed the outlet of the return (141).

4. The gas burner system of claim 1, wherein the outer support nozzle (125) has an orifice location beyond the exit of the throat (142) of the flue gas recirculation mixing drum (140).

5. The gas burner system of claim 1, wherein the bluff body (160) has an overall shape that is wide at the front and narrow at the back, with the wide end facing the inner barrel (150).

6. The gas burner system of claim 5, wherein the bluff body (160) is hollow and the outer wall surface is streamlined.

7. The gas burner system according to claim 1, wherein each of said injector pipes (126) has an injection outlet directed radially outwardly at an angle in the range of 0 ° to 80 ° to the longitudinal axis of said air supply duct (110).

8. The gas burner system according to claim 1, characterized in that the 2 nd fuel supply system (130) has two sets of external nozzles (133) all surrounding the flue gas recirculation mixing drum (140), and a second set of external nozzles (133b) surrounding the first set of external nozzles (133a), the two sets of external nozzles (133) being respectively circumferentially equispaced outside the flue gas recirculation mixing drum (140).

9. The gas burner system according to claim 1, wherein the injection ports of the first set of outer nozzles (133a) of the 2 nd fuel supply system (130) are at an angle of 0 ° -15 ° to the longitudinal axis of the air supply duct (110); the jet ports of the second group of outer nozzles (133b) form an angle of 5-20 degrees with the longitudinal axis of the air supply duct (110).