阅读说明：本技术 一种稳焰盘及燃烧器 (Steady flame dish and combustor ) 是由 林继铭 李浩蓁 林得福 张勇 苏波 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种稳焰盘及燃烧器,稳焰盘包括第一罩筒、第一旋流叶轮、第二罩筒和第二旋流叶轮,第一罩筒同轴嵌套在第二罩筒之内,第一旋流叶轮设在第一罩筒之内,第二旋流叶轮设在第一罩筒和第二罩筒之间,第一旋流叶轮的叶片和第二旋流叶轮的叶片均沿周向均匀间隔布设,第一旋流叶轮上的各叶片与周向切线之间具有相同的倾斜夹角,第二旋流叶轮上的各叶片与周向切线之间具有相同的倾斜夹角,第一旋流叶轮和第二旋流叶轮沿轴向按照气流流经顺序先后间隔布设。燃烧器包括风筒,风筒的一端设有风机且另一端装接一燃烧筒,燃烧筒和风筒之间装接有所述的稳焰盘。它具有如下优点：减少氮氧化物的产生,提高燃烧效率和改善燃烧效果。(The invention discloses a flame stabilizing disc and a combustor, wherein the flame stabilizing disc comprises a first cover cylinder, a first rotational flow impeller, a second cover cylinder and a second rotational flow impeller, the first cover cylinder is coaxially nested in the second cover cylinder, the first rotational flow impeller is arranged in the first cover cylinder, the second rotational flow impeller is arranged between the first cover cylinder and the second cover cylinder, blades of the first rotational flow impeller and blades of the second rotational flow impeller are uniformly arranged at intervals along the circumferential direction, the same inclined included angle is formed between each blade on the first rotational flow impeller and the circumferential tangent line, the same inclined included angle is formed between each blade on the second rotational flow impeller and the circumferential tangent line, and the first rotational flow impeller and the second rotational flow impeller are sequentially arranged at intervals along the axial direction according to the airflow flowing sequence. The combustor comprises an air duct, one end of the air duct is provided with a fan, the other end of the air duct is connected with a combustion drum, and the flame stabilizing disc is connected between the combustion drum and the air duct. It has the following advantages: reduce the generation of nitrogen oxides, improve the combustion efficiency and improve the combustion effect.)

1. A flame stabilizing disc is characterized in that: the first cover cylinder is coaxially nested in the second cover cylinder, the first cyclone impeller is arranged in the first cover cylinder, the second cyclone impeller is arranged between the first cover cylinder and the second cover cylinder, blades of the first cyclone impeller and blades of the second cyclone impeller are uniformly arranged at intervals along the circumferential direction, the same inclined included angle is formed between each blade on the first cyclone impeller and a circumferential tangent line, the same inclined included angle is formed between each blade on the second cyclone impeller and the circumferential tangent line, and the first cyclone impeller and the second cyclone impeller are sequentially arranged at intervals along the axial direction according to the airflow flowing sequence.

2. A flame stabilizing disc according to claim 1, wherein: the wall of the second cover cylinder is provided with a plurality of first small holes which are uniformly distributed along the circumferential direction, and the aperture of each first small hole is gradually reduced along the airflow direction.

3. A flame stabilizing disc according to claim 1, wherein: the wall of the first cover cylinder gradually slants and converges toward the central axis along the airflow direction.

4. A flame stabilizing disc according to claim 1, wherein: the second cover cylinder has a cylinder wall gradually inclined and retracted toward the central axis along the flow direction of the air flow.

5. A flame stabilizing disc according to claim 1, wherein: a plurality of second small holes are distributed at one end part of the blade of the first rotational flow impeller, which is close to the central axis.

6. A flame stabilizing disc according to claim 1, wherein: the blades of the first rotational flow impeller and the blades of the second rotational flow impeller have different inclination angles.

7. A burner, characterized by: the flame stabilizing disc comprises an air duct, wherein one end of the air duct is provided with a fan for blowing air flow into the air duct, the other end of the air duct is connected with a combustion tube, the combustion tube and the air duct are connected with one another by a flame stabilizing disc as claimed in any one of claims 1 to 6, the center of the flame stabilizing disc is provided with a first gas nozzle penetrating through a first rotational flow impeller, a plurality of second gas nozzles penetrating through a second rotational flow impeller are arranged between a second cover cylinder and a first cover cylinder of the flame stabilizing disc, the plurality of second gas nozzles are arranged at intervals in the circumferential direction, the first gas nozzle is communicated with a first gas supply air passage, and the second gas nozzle is communicated with a second gas supply air passage.

8. A burner as claimed in claim 7, wherein: the second gas nozzle is positioned at the forward end of the gas flow direction of the nozzle of the first gas nozzle.

9. A burner as claimed in claim 7 or 8, wherein: the nozzle openings of the second gas nozzle and the first gas nozzle are respectively provided with a plurality of gas holes for jetting gas, and the aperture of the gas hole on the first gas nozzle is larger than that of the gas hole on the second gas nozzle.

10. A burner as claimed in claim 7, wherein: the plurality of second gas nozzles are arranged at even intervals around the circumferential direction.

Technical Field

The invention relates to a gas combustion structure, in particular to a flame stabilizing disc and a combustor.

Background

The annual book of world energy statistics in 2018 indicates that China is still the largest energy consuming country in the world, and people pay more attention to environmental problems caused by energy consumption, so that the improvement of energy efficiency and the environmental protection are still two main subjects of energy research science.

NOx (nitrogen oxides) generated during combustion is a main factor causing environmental pollution, the amount of generated NOx becomes an important index for measuring the combustion performance of the burner, and NOx, which is a combustion product, is harmful to the environment and human bodies, so that the amount of NOx emission needs to be controlled. A burner is a device that converts chemical energy of a fuel into heat energy. The basic use of the combustion device is to reasonably organize the combustion process of the fuel in the heat exchange device so as to ensure that the work of the combustion device meets the requirements of the process, the technology, the economy and the environmental protection. The combustion method of the fuel and the reasonable structure of the combustion device have direct and important influence on the thermal process in the equipment. Therefore, there is a need to provide an improved gas burner, which can generate extremely low nitrogen oxides and improve the combustion efficiency of the gas, thereby achieving better energy-saving and environmental-friendly effects.

Disclosure of Invention

The present invention provides a flame stabilizing disc and burner that overcomes the deficiencies of the prior art described in the background of the invention.

One of the technical schemes adopted by the invention for solving the technical problems is as follows:

a flame stabilizing disc comprises a first cover cylinder, a first rotational flow impeller, a second cover cylinder and a second rotational flow impeller, wherein the first cover cylinder is coaxially nested in the second cover cylinder, the first rotational flow impeller is arranged in the first cover cylinder, the second rotational flow impeller is arranged between the first cover cylinder and the second cover cylinder, blades of the first rotational flow impeller and blades of the second rotational flow impeller are uniformly arranged at intervals along the circumferential direction, the same inclined included angle is formed between each blade on the first rotational flow impeller and a circumferential tangent line, the same inclined included angle is formed between each blade on the second rotational flow impeller and the circumferential tangent line, and the first rotational flow impeller and the second rotational flow impeller are arranged at intervals along the axial direction according to the airflow flowing sequence.

In one embodiment: the wall of the second cover cylinder is provided with a plurality of first small holes which are uniformly distributed along the circumferential direction, and the aperture of each first small hole is gradually reduced along the airflow direction.

In one embodiment: the wall of the first cover cylinder gradually slants and converges toward the central axis along the airflow direction.

In one embodiment: the second cover cylinder has a cylinder wall gradually inclined and retracted toward the central axis along the flow direction of the air flow.

In one embodiment: a plurality of second small holes are distributed at one end part of the blade of the first rotational flow impeller, which is close to the central axis.

In one embodiment: the blades of the first rotational flow impeller and the blades of the second rotational flow impeller have different inclination angles.

The second technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a combustor, it includes the dryer, the one end of dryer is equipped with the fan that blows in the dryer with the air current, the other end of dryer connects a combustion cylinder, this combustion cylinder and the dryer connect between have one of technical scheme a steady flame dish, the center of steady flame dish is established and is run through first gas nozzle of first whirl impeller, be equipped with a plurality of second gas nozzle that run through second whirl impeller between the second cover section of thick bamboo of steady flame dish and the first cover section of thick bamboo, these a plurality of second gas nozzle are laid around circumference interval, this first gas nozzle switch-on first air feed air flue, this second gas nozzle switch-on second air feed air flue.

In one embodiment: the second gas nozzle is positioned at the forward end of the gas flow direction of the nozzle of the first gas nozzle.

In one embodiment: the nozzle openings of the second gas nozzle and the first gas nozzle are respectively provided with a plurality of gas holes for jetting gas, and the aperture of the gas hole on the first gas nozzle is larger than that of the gas hole on the second gas nozzle.

In one embodiment: the plurality of second gas nozzles are arranged at even intervals around the circumferential direction.

Compared with the background technology, the technical scheme has the following advantages:

the present case stable flame dish through first cover section of thick bamboo, the second cover section of thick bamboo is divided into two regions (first whirl impeller district and second whirl impeller district) with the burning zone, through the subregion burning, make two regional pressure differentials that produce in the combustion process, two regional energy exchanges, accelerate the mixing degree of air and fuel, the air that flows into through first whirl impeller and second whirl impeller convection current in the burning section of thick bamboo cuts in advance and produces rotatory air current, make the air be the heliciform and rise, the circulation of air speed has been accelerated, and the air that the spiral shell screwing up goes out with the gas intensive mixing burning of gas nozzle, let burning rapid more stable, improve combustion efficiency, the spiral flow of air can also cool down the burning section of thick bamboo in addition, avoid producing local high-temperature area, reduce nitrogen oxide's emission.

The combustor is provided with the flame stabilizing disc, has all the advantages of the flame stabilizing disc, is provided with a first gas nozzle penetrating through a first swirl impeller at the center of the flame stabilizing disc, and is provided with a plurality of second gas nozzles penetrating through a second swirl impeller between a second cover cylinder and a first cover cylinder of the flame stabilizing disc, so that flame can be effectively dispersed, the condition of local high temperature is reduced, and the generation of thermal nitrogen oxides is effectively reduced. The first gas supply air passage and the second gas supply air passage can respectively provide fuels with different concentrations for the first gas nozzle and the second gas nozzle, and the optimal combustion effect can be obtained by correcting the proportion of the fuels in the first gas supply air passage and the second gas supply air passage.

Drawings

The invention is further illustrated by the following figures and examples.

Fig. 1 is a schematic perspective view of a flame stabilizing disc according to the first embodiment.

Fig. 2 is a front view of the flame stabilizing disc according to the first embodiment.

Fig. 3 is a schematic view of the overall structure of the burner according to the second embodiment.

Fig. 4 is a sectional view a-a of fig. 3.

Detailed Description

In the first embodiment, referring to fig. 1 and 2:

a flame stabilizing disc 10 comprises a first cover cylinder 11, a first rotational flow impeller 12, a second cover cylinder 13 and a second rotational flow impeller 14, wherein the first cover cylinder 11 is coaxially nested in the second cover cylinder 13, the first rotational flow impeller 12 is arranged in the first cover cylinder 11, the second rotational flow impeller 14 is arranged between the first cover cylinder 11 and the second cover cylinder 13, blades of the first rotational flow impeller 12 and blades of the second rotational flow impeller 14 are uniformly distributed at intervals along the circumferential direction, the blades on the first rotational flow impeller 12 and a circumferential tangent line have the same inclined included angle, the blades on the second rotational flow impeller 14 and the circumferential tangent line have the same inclined included angle, and the first rotational flow impeller 12 and the second rotational flow impeller 14 are sequentially distributed at intervals along the axial direction according to the airflow flowing sequence. The blades of the first swirl impeller 12 and the second swirl impeller 14 are uniformly arranged around the circumference at intervals.

Air that flows into in the combustion cylinder through first whirl impeller 12 and second whirl impeller 14 cuts in advance and produces rotatory air current, makes the air be the heliciform and rises for circulation of air speed, and the air that the spiral shell screwing in rises and the gas intensive mixing burning that the gas nozzle came out, lets burning rapid more stable, improves combustion efficiency. In addition, the spiral flow of air can also cool the combustion cylinder, so that a local high-temperature area is avoided, and the emission of nitrogen oxides is reduced.

The wall of the second cover cylinder 13 is provided with a plurality of first small holes 131, the first small holes 131 are uniformly distributed along the circumferential direction, and the aperture of each first small hole 131 is gradually reduced along the airflow direction. A plurality of second apertures 121 have been laid near a central axis tip on this first whirl impeller's blade 12, the aperture of these second apertures 121 can be different in size, each second aperture 121 is laid according to the aperture by big to little in radial direction, this setting up of second aperture 121 helps producing the backward flow in the combustion process, inhale back the combustion barrel through second aperture 121 part burning flue gas again in, the flue gas mixed fuel that the book was inhaled back, the concentration of oxygen has been reduced, form the diffusion combustion, slow down the combustion reaction, the flame temperature has been reduced, the combustion temperature distributes evenly, the production of nitrogen oxide has been reduced.

The wall of the first cover tube 11 gradually converges obliquely toward the central axis along the airflow direction. The cylinder wall of the second cover cylinder 13 gradually converges obliquely toward the central axis along the airflow direction. That is, the first shroud 11 and the second shroud 13 are each in a frustum shape, and the small diameter end thereof is directed toward the airflow flow front end, and the inclination of the first shroud 11 and the second shroud 13 guides the combustion gas and the air toward the center of the combustion cylinder, so that the combustion is more sufficient, and the combustion efficiency is higher. Meanwhile, the first cover cylinder 11 and the second cover cylinder 13 of the inward contraction structure enable the structure to be more compact and reduce the whole size of the structure.

The blades 12 of the first swirl impeller and the blades 14 of the second swirl impeller are inclined at different angles. The mixing degree of gas and air can be increased, and the disturbance of combustion airflow is enhanced to form a good aerodynamic field beneficial to combustion, so that the gas is fully combusted. The angle values of the included angles between the blades of the first rotational flow impeller 12 and the second rotational flow impeller 14 and the respective tangential directions thereof can be sequentially and progressively decreased from the center to the outside in the radial direction, and the sequential progressive decrease of the angle between the blade of each rotational flow impeller and the respective tangential direction thereof can effectively prevent the problem of air flow deflection in the combustion process, so that the mixing degree of gas and air is enhanced.

In a second embodiment, please refer to fig. 1 to 4:

a burner comprises an air duct 20, wherein one end of the air duct 20 is provided with a fan 30 for blowing air flow into the air duct 20, the other end of the air duct 20 is provided with a combustion barrel 40, a flame stabilizing disc 10 in the first embodiment is arranged between the combustion barrel 40 and the air duct 20, the center of the flame stabilizing disc 10 is provided with a first gas nozzle 50 penetrating through a first cyclone impeller 12, a plurality of second gas nozzles 60 penetrating through a second cyclone impeller 14 are arranged between a second cover barrel 13 and a first cover barrel 11 of the flame stabilizing disc 10, the plurality of second gas nozzles 60 are arranged at intervals in the circumferential direction, the first gas nozzle 50 is communicated with a first gas supply air duct 70, and the second gas nozzles 60 are communicated with a second gas supply air duct 80. The first air supply duct 70 and the second air supply duct 80 are two independent ducts that do not communicate with each other. The first air supply passage 70 and the second air supply passage 80 can be respectively filled with fuel with different concentrations, and the optimal combustion effect can be obtained by correcting the proportion of the fuel in the first air supply passage 70 and the second air supply passage 80. Through the nozzle structure (namely the first gas nozzle 50 and the plurality of second gas nozzles 60) suitable for multi-zone combustion, flame can be effectively dispersed, the condition of local high temperature is reduced, and the generation of thermal nitrogen oxides is effectively reduced.

The first gas nozzle 50 is arranged at the center of the first swirl impeller 12, the second gas nozzle 60 is arranged on the second swirl impeller 14, and the combustion near the first fuel nozzle 50 at the center and the combustion near the second fuel nozzle 60 at the periphery are divided by combining the first cover cylinder 11 and the second cover cylinder 13, so that two flame zones (the area where the first gas nozzle 50 at the center is located and the area where the second gas nozzle 60 at the periphery is located) are formed, the introduced gas can be rapidly and timely ignited to form a good aerodynamic field, the combustion state of the gas is stabilized, and the situations of backfire or misfire in the furnace are avoided. Through the subregion burning, make the combustion process in two regions produce pressure differential, two regions produce energy exchange for the mixed degree of air and fuel strengthens burning intensity, and the burning torch shortens, and then reaches and reduces the furnace size, and improves combustion efficiency's purpose. The fuel and the air form a fuel-rich flame zone in the area near the first gas nozzle, only part of the fuel is combusted due to oxygen deficiency, and the fuel is volatilized in the flame zone which is low in oxygen and flame temperature, so that the generation of nitrogen oxides is reduced.

The second gas nozzle 60 nozzle is located at the forward end of the flow of the gas stream from the nozzle of the first gas nozzle 50. The gas which is not completely combusted at the position of the first gas nozzle 50 can be continuously combusted near the second gas nozzle 60 at the front end of the gas flow, the emission of low-price nitrogen oxides is reduced again, meanwhile, the structure also contributes to the stability of flame, the fluctuation of the flame is reduced, stable combustion is provided, and the combustion effect is improved.

The second gas nozzle 60 and the first gas nozzle 50 are provided with a plurality of gas holes 51 and 61 for ejecting gas at their nozzle openings. The aperture of the air hole 51 of the first gas nozzle 50 is larger than that of the air hole 61 of the second gas nozzle 60, so that a swirling flow with high intensity is generated near the first gas nozzle 50, and a central negative pressure is formed near the first gas nozzle 50, thereby being beneficial to the rapid and stable combustion of gas. The plurality of second gas nozzles 60 are arranged at regular intervals around the circumferential direction. The air holes 51, 61 are both circular.

The joint of the first gas nozzle 50 and the first swirl impeller 12 is provided with a sealing structure, so that the gas sprayed from the first gas nozzle 50 can be prevented from flowing out through the joint gap between the first gas nozzle 50 and the first swirl impeller 12. The sealing structure may be a ring, and the first gas nozzle 50 is fixed to the center of the first swirl impeller 12 by the ring.

The air flow direction (or the air flow direction or the sequence of the air flow) in the present case is the total air flow direction formed in the air duct 20, the flame stabilizing disc 10 and the combustion drum 40 when the fan 30 blows to the air duct 20.

The flame stabilizing disc 10 is unique and reasonable in structural design, and can reduce the generation of nitrogen oxides in the thermotechnical process of a combustor adopting the flame stabilizing disc 10, protect the environment and ensure good combustion efficiency and combustion effect.

The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.