ARRAY TYPE FLUE GAS CIRCULATION GAS BURNER

Description

TECHNICAL FIELD

The present invention belongs to the technical field of gas burners, and particularly relates to an array type flue gas circulation gas burner.

BACKGROUND

A traditional diffusion type gas burner usually includes one burning head, and all burning-supporting air and gas are organized by means of this burning head, so that there is usually one main flame only, and the thermal load is concentratedly released in this flame. However, a burner using a distributed flue gas internal circulation technology is composed of a plurality of burning head modules as per a certain layout, and each burning head module forms an independent flame, so that a flame of the burner is divided into a plurality of small flames, the thermal load is distributed more uniformly, and a hot spot is easier to control.

The traditional flue gas internal circulation diffusion type gas burner has only one main flame, so that the proportion of internal circulation flue gas directly participating in the internal flame is very low. However, according to the distributed flue gas internal circulation technology, the flue gas can directly enter the position of each burning head module, so that the flue gas can participate in the flame of each module, and ultra-low nitrogen burning can be achieved more easily.

Besides, the traditional diffusion type burner includes only one burning head, so that fuel and the burning-supporting air cannot be uniformly distributed in space; during burning with the excessively high concentration of the fuel, CH free radicals generated by pyrolysis of hydrocarbons react with nitrogen in the air to generate HCN and N, which further react with oxygen to generate nitric oxides at a very high speed, and then instantaneous nitrogen oxides are inevitable; besides, due to the large length of the flame, the stability of the flame is poor, the high adjustment ratio cannot be achieved, the adjustment ratio is usually lower than 1:4, and the requirement for the air excess coefficient is high and is usually higher than 1.2; moreover, according to the distributed flue gas internal circulation burner, by means of the plurality of burning head modules, the burning-supporting air and the gas are uniformly distributed in the space, thereby avoiding zones with the unbalanced air-gas ratio, and reducing the generation of rapid nitrogen oxides.

The applicant has filed a patent of CN116006971A, where a plurality of small gas nozzles are circumferentially and annularly arrayed on the periphery of a burner, and an annular burning-supporting air spray port is formed. However, such structure needs to be very large, and the flue gas circulation effect formed by the single small gas nozzle is poor.

SUMMARY

In order to solve the above-mentioned problems, the present invention provides an array type flue gas circulation gas burner.

The purpose of the present invention is achieved in the following manner:

An array type flue gas circulation gas burner, comprising single flue gas burning modules 2, wherein the flue gas burning modules 2 are arranged in an annular array; each of the flue gas burning modules 2 is capable of circulating flue gas separately; and the flue gas burning modules 2 arranged in the array share a gas source and an air source.

wherein each of the single flue gas burning modules 2 is inclined outwards in a direction away from an annular center.

wherein the flue gas burning modules 2 are fixedly connected to a mounting plate 11, the mounting plate 11 is fixedly connected to a cylinder body 1, a partition board 12 is provided inside the cylinder body 1, the interior of the cylinder body 1 is divided by the partition board 12 into a burning-supporting air chamber 13 and a gas chamber 14, the burning-supporting air chamber 13 is connected to a burning-supporting air inlet system 3, the gas chamber 14 is connected to a gas inlet system 4, the flue gas burning modules 2 penetrate through the mounting plate 11, and air inlet structures are respectively formed between the flue gas burning modules and the burning-supporting air chamber 13 and between the flue gas burning modules and the gas chamber 14.

The array type flue gas circulation gas burner according to claim 3, wherein each of the flue gas burning modules 2 comprises an outer cylinder 21, the outer cylinder 21 penetrates through the mounting plate 11 and extends into the burning-supporting air chamber 13, a portion of the outer cylinder extending into the burning-supporting air chamber 13 is connected to an air inlet cylinder 22, and an air inlet 221 is formed in the air inlet cylinder 22; and a gas pipe 23 is wrapped in the outer cylinder 21, and a tail end of the gas pipe 23 penetrates through a cylinder wall of the outer cylinder 21 and is in communication with the gas chamber 14.

wherein each of the air inlets 221 is formed on one side of the air inlet cylinder 22, an adjustment cylinder 222 is sleeved with the air inlet cylinder 22, an air inlet adjustment port 2221 corresponding to the air inlet 221 is formed in the adjustment cylinder 222, the adjustment cylinder 222 is fixedly connected to a first rotating shaft 223, the first rotating shaft 223 is rotationally connected in the air inlet cylinder 22, the first rotating shaft 223 and the air inlet cylinder 22 are provided coaxially, and one end of the first rotating shaft 223 penetrates through the air inlet cylinder 22 to be connected to a driving mechanism.

wherein a burning head burning-supporting air inlet adjustment system 5 for driving the first rotating shafts 223 of all the flue gas burning modules 2 is provided.

wherein the burning head burning-supporting air inlet adjustment system 5 comprises an electric motor 51, the electric motor 51 is fixedly connected to the cylinder body 1, an output end 511 of the electric motor 51 penetrates through the cylinder body 1 to be coaxially and fixedly connected to a second rotating shaft 52, the second rotating shaft 52 is fixedly connected to one end of a first swing arm 53, the first swing arm 53 is provided in a radial direction of the second rotating shaft 52, the other end of the first swing arm 53 is rotationally connected to a first connecting rod 54, at least one second swing arm 55 is rotationally connected to the first connecting rod 54, the second swing arms 55 and the first swing arm 53 have equal lengths and are provided in parallel, each of the second swing arms 55 is fixedly connected to one end of a third rotating shaft 56, all the third rotating shafts 56 penetrate through a limiting column 15, the third rotating shafts 56 are rotationally connected to the limiting column 15, the limiting column 15 is fixedly connected to the cylinder body 1, the other end of each of the third rotating shafts 56 is fixedly connected to one end of a third swing arm 57, the other end of each of the third swing arms 57 is rotationally connected to a second connecting rod 58, at least one fourth swing arm 59 is rotationally connected to each of the second connecting rods 58, the fourth swing arms 59 and the third swing arms 57 have equal lengths and are provided in parallel, and the fourth swing arms 59 are fixedly connected to the first rotating shafts 223.

wherein each of the gas pipes 23 comprises a main gas pipe 231 and a central gas pipe 232 wrapped in the main gas pipe 231, and tail ends of the main gas pipe 231 and the central gas pipe 232 respectively penetrate through the cylinder wall of the outer cylinder 21 to be in communication with the gas chamber 14; a front end of the main gas pipe 231 is fixedly connected to a conical rectifier 24, a burning-supporting air annular jet outlet 25 is formed between the conical rectifier 24 and the outer cylinder 21, a main gas jet pipe 2311 is provided on one side of the main gas pipe 231, and the main gas jet pipe 2311 extends out of the burning-supporting air annular jet outlet 25; and the central gas pipe 232 penetrates through the conical rectifier 24 and extends out from a front end of the conical rectifier 24.

wherein at least two positioning plates 27 are provided on one side of each of the main gas pipes 231, and outer ends of the positioning plates 27 abut against an inner wall of the outer cylinder 21.

compared with the prior art, the present invention has the advantages that each flue gas burning module independently exchanges momentum with high-temperature flue gas in a hearth to form an entrainment effect, the flue gas can be circulated separately, and the plurality of flue gas burning modules are provided in an annular array, so that the flue gas can be circulated outside and inside rings, thereby:

• • 1. avoiding the non-uniformity of the burning thermal load;
  • 2. achieving uniform distribution of burning-supporting air and gas, avoiding burning of fuel under the excessively high concentration in any zone of the fuel, and reducing generation of instantaneous nitrogen oxides;
  • 3. allowing the flue gas to pass through the ring of each burning head module to achieve high-speed jetting of the burning-supporting air to inject the flue gas, so as to enable the flue gas to participate in mixing and burning of each module, reducing the hot spot temperature of a burning zone, and reducing the generation of thermal nitrogen oxides; and
  • 4. uniformly distributing the gas and the burning-supporting air by means of all the modules, which is beneficial to mixing, thus a flame is short, the stability of the flame is improved, and the adjustment ratio of the burner is increased.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram of a flue gas circulation gas burner;

FIG. 2 is a front view of the flue gas circulation gas burner;

FIG. 3 is a section view of the flue gas circulation gas burner;

FIG. 4 is a section view of a flue gas burning module;

FIG. 5 is structural schematic diagram of a burning head burning-supporting air inlet adjustment system;

FIG. 6 is a section view of an air inlet cylinder;

FIG. 7 is a structural schematic diagram of an adjustment cylinder;

FIG. 8 is a section view of a tail end of a gas pipe;

FIG. 9 is a section view of a front end of the gas pipe;

FIG. 10 is a schematic diagram of a flue gas circulation effect of a single flue gas burning module; and

FIG. 11 is a schematic diagram of a flue gas circulation effect of an outward swing structure of the flue gas burning module.

In the drawings: cylinder body 1, mounting plate 11, partition board 12, burning-supporting air chamber 13, gas chamber 14, and limiting column 15;

• • flue gas burning module 2, outer cylinder 21, air inlet cylinder 22, air inlet 221, adjustment cylinder 222, air inlet adjustment port 2221, first rotating shaft 223, gas pipe 23, main gas pipe 231, main gas jet pipe 2311, central gas pipe 232, conical rectifier 24, burning-supporting air annular jet outlet 25, flange 26, and positioning plate 27;
  • burning-supporting air inlet system 3, and chamber burning-supporting air inlet 31;
  • gas inlet system 4, and chamber gas inlet 41; and
  • burning head burning-supporting air inlet adjustment system 5, electric motor 51, output end 511, electric motor mounting frame 512, second rotating shaft 52, first swing arm 53, first connecting rod 54, second swing arm 55, third rotating shaft 56, third swing arm 57, second connecting rod 58, and fourth swing arm 59.

DETAILED DESCRIPTION OF EMBODIMENTS

The technical solutions in embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of embodiments of the present invention, not all of them. On the basis of the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without involving any inventive effort should fall within the scope of protection of the present invention.

In the present invention, unless otherwise explicitly specified and limited, orientation or position relationships indicated by the terms such as “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like are orientation or position relationships based on the accompanying drawings, are only for the purposes of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that a device or an element referred to must have the specific orientation or be constructed and operated in the specific orientation. Therefore, they cannot be understood as limitations on the present invention.

As shown in FIGS. 1-2, an array type flue gas circulation gas burner includes individual flue gas burning modules 2, where the flue gas burning modules 2 are arranged in an annular array, and may be in a circular ring shape or a polygonal ring; each of the flue gas burning modules 2 is capable of circulating flue gas separately; and the flue gas burning modules 2 arranged in the array share a gas source and an air source.

Each flue gas burning module 2 can spray gas and burning-supporting air independently, and the flue gas formed after momentum exchange with high-temperature flue gas in a hearth is as shown in FIG. 10 and flows back and circulates in a fountain shape towards the surroundings. The flue gas burning modules 2 can be loosely provided at large intervals, for example, as shown in FIGS. 1-2, six said modules are provided in one circle; said modules can also be densely provided at small intervals, for example, 8-20 said modules are provided, then the interval between the adjacent flue gas burning modules 2 is small, and thus flue gas circulation is formed towards the surroundings; and the flue gas and flue gas of the flue gas burning modules 2 on two sides repel each other, so that the surrounding circulation is changed into concentrated circulation inside or outside a ring, which does not affect the use effect.

Further, as shown in FIG. 11, the single flue gas burning modules 2 are inclined outwards in a direction away from an annular center to form a flared structure, so that a larger flue gas circulation space is reserved in the ring; and an inclination angle is x, 0≤x≤60°, and preferably, 10°≤x≤40°.

Further, as shown in FIG. 3, the flue gas burning modules 2 are fixedly connected to a mounting plate 11, the mounting plate 11 is fixedly connected to a cylinder body 1, the mounting plate 11 and the cylinder body 1 are connected to form a closed cylinder structure, a partition board 12 is provided inside the cylinder body 1, the interior of the cylinder body 1 is divided by the partition board 12 into a burning-supporting air chamber 13 and a gas chamber 14, the burning-supporting air chamber 13 is connected to a burning-supporting air inlet system 3, the burning-supporting air inlet system 3 belongs to the prior art, includes an air pipe and a fan and is configured to provide a negative pressure to form the burning-supporting air which is sent into the burning-supporting air chamber 13, a chamber burning-supporting air inlet 31 is formed at the joint of the burning-supporting air inlet system 3 and the burning-supporting air chamber 13, the gas chamber 14 is connected to a gas inlet system 4, the gas inlet system 4 belongs to the prior art and is configured to input the gas into the gas chamber 14, a chamber gas inlet 41 is formed at the joint of the gas inlet system 4 and the gas chamber 14, the flue gas burning modules 2 penetrate through the mounting plate 11, and air inlet structures are respectively formed between the flue gas burning modules and the burning-supporting air chamber 13 and between the flue gas burning modules and the gas chamber 14.

Further, as shown in FIG. 4, each of the flue gas burning modules 2 includes an outer cylinder 21, the outer cylinder 21 penetrates through the mounting plate 11 and extends into the burning-supporting air chamber 13, a flange 26 is fixed to a peripheral side of the outer cylinder 21, the outer cylinder is fixedly connected to the partition board 12 by means of the flange 26, a portion of the outer cylinder extending into the burning-supporting air chamber 13 is connected to an air inlet cylinder 22, and an air inlet 221 is formed in the air inlet cylinder 22; and

• • a gas pipe 23 is wrapped in the outer cylinder 21, and a tail end of the gas pipe 23 penetrates through a cylinder wall of the outer cylinder 21 and is in communication with the gas chamber 14.

Further, as shown in FIG. 6, each of the air inlets 221 is formed on one side of the air inlet cylinder 22, an adjustment cylinder 222 is sleeved with the air inlet cylinder 22, and preferably, an inner wall of the air inlet cylinder 22 is matched with an outer wall of the adjustment cylinder 222 in size; an air inlet adjustment port 2221 corresponding to the air inlet 221 is formed in the adjustment cylinder 222, there may be a plurality of air inlet adjustment port 2221, and as shown in FIG. 7, widths of the air inlet adjustment ports 2221 are changed in a circumferential direction; the adjustment cylinder 222 is fixedly connected to a first rotating shaft 223, and preferably, as shown in the drawings, is connected by means of one or more connection rods, and an air passing channel is reserved; and the first rotating shaft 223 is rotationally connected in the air inlet cylinder 22, the first rotating shaft 223 and the air inlet cylinder 22 are provided coaxially, and one end of the first rotating shaft 223 penetrates through the air inlet cylinder 22 to be connected to a driving mechanism.

Each first rotating shaft 223 can be driven by the independent driving mechanism; however, preferably, a burning head burning-supporting air inlet adjustment system 5 for driving the first rotating shafts 223 of all the flue gas burning modules 2 is further provided.

Further, as shown in FIG. 5, the burning head burning-supporting air inlet adjustment system 5 includes an electric motor 51, the electric motor 51 is fixedly connected to the cylinder body 1, an electric motor mounting frame 512 is fixed to a tail end of the cylinder body 1, a body of the electric motor 51 is fixed to the electric motor mounting frame 512, an output end 511 of the electric motor 51 penetrates through the cylinder body 1 to be coaxially and fixedly connected to a second rotating shaft 52 by means of a coupling (not shown), the second rotating shaft 52 is fixedly connected to one end of a first swing arm 53, the first swing arm 53 is provided in a radial direction of the second rotating shaft 52, the other end of the first swing arm 53 is rotationally connected to a first connecting rod 54, at least one second swing arm 55 is rotationally connected to the first connecting rod 54, the second swing arms 55 and the first swing arm 53 have equal lengths and are provided in parallel, each of the second swing arms 55 is fixedly connected to one end of a third rotating shaft 56, all the third rotating shafts 56 penetrate through a limiting column 15, the third rotating shafts 56 are rotationally connected to the limiting column 15, and the limiting column 15 is fixedly connected to the cylinder body 1, so that the second swing arms 55 and the first swing arm 53 can rotate synchronously, and the second rotating shaft 52 and the third rotating shafts 56 can rotate synchronously.

The other end of each of the third rotating shafts 56 is fixedly connected to one end of a third swing arm 57, the other end of each of the third swing arms 57 is rotationally connected to a second connecting rod 58, at least one fourth swing arm 59 is rotationally connected to each of the second connecting rods 58, the fourth swing arms 59 and the third swing arms 57 have equal lengths and are provided in parallel, and the fourth swing arms 59 are fixedly connected to the first rotating shafts 223, so that the third swing arms 57 and the fourth swing arms 59 can rotate synchronously, the third rotating shafts 56 and the first rotating shafts 223 can rotate synchronously; and the swing arms are rod-like, one end of each swing arm is fixed to the rotating shaft, and the other end of each swing arm is rotationally connected to the connecting rod by means of a rotating member.

When the projections of the first rotating shafts 223 in axial directions do not overlap with the limiting column 15, the above connecting structures may be used and are preferred; and when the projections of the first rotating shafts 223 in the axial directions overlap with the limiting column 15, the third rotating shafts 56 may be directly, coaxially and fixedly connected to the first rotating shaft 223 by means of the couplings (not shown) as shown on an upper side of FIG. 5.

By means of the above structures, opening, closing and opening sizes of the air inlets 221 of all the flue gas burning modules 2 are controlled by means of the single driving mechanism.

Further, as shown in FIG. 8, each of the gas pipes 23 includes a main gas pipe 231 and a central gas pipe 232 wrapped in the main gas pipe 231, tail ends of the main gas pipe 231 and the central gas pipe 232 respectively penetrate through the cylinder wall of the outer cylinder 21 to be in communication with the gas chamber 14, and the central gas pipe 232 sequentially penetrates through the tail end of the main gas pipe 231 and the side wall of the outer cylinder 21;

• • as shown in FIG. 9, a front end of the main gas pipe 231 is fixedly connected to a conical rectifier 24, which may be simplest a conical variable-diameter block, and by means of the conical rectifier 24, the diameter of the front end of the main gas pipe 231 gradually increases, so that a burning-supporting air annular jet outlet 25 is formed between the conical rectifier and the outer cylinder 21; a main gas jet pipe 2311 is provided on one side of the main gas pipe 231, and the main gas jet pipe 2311 extends out of the burning-supporting air annular jet outlet 25 and is arranged in an annular array; and the central gas pipe 232 penetrates through the conical rectifier 24 and extends out from a front end of the conical rectifier 24.

Further, at least two, preferably four, positioning plates 27 are provided on one side of each of the main gas pipes 231, outer ends of the positioning plates 27 abut against an inner wall of the outer cylinder 21, and the positioning plates are configured to limit the relative positions of the outer cylinder 21 and the gas pipe 23.

The present invention has the following beneficial effects:

• • 1. the burning thermal load is dispersed in a certain number of small flames, thereby avoiding the non-uniformity of the burning thermal load, and reducing the hot spot temperature;
  • 2. uniform distribution of the burning-supporting air and the gas is achieved, burning of fuel under the excessively high concentration in any zone of the fuel is avoided, and generation of instantaneous nitrogen oxides is reduced;
  • 3. the flue gas passes through the ring of each burning head module to achieve high-speed jetting of the burning-supporting air to inject the flue gas, so as to enable the flue gas to participate in mixing and burning of each module, thereby reducing the hot spot temperature of a burning zone, and reducing the generation of thermal nitrogen oxides;
  • 4. the gas and the burning-supporting air are uniformly distributed by means of all the modules, which is beneficial to mixing, thus the flame is short, the stability of the flame is improved, and the adjustment ratio of the burner is increased; and
  • 5. the total air excess coefficient is maintained to be 1.1-1.15, thereby reducing the flue gas amount, and improving the boiler efficiency.

The above are only preferred embodiments of the present invention; and it should be pointed out that a person skilled in the art can also make several amendments and improvements on the premise of not departing from the overall concept of the present invention, and these amendments and improvements should also fall within the scope of protection of the present invention.