CN220119365U

CN220119365U - Flame stabilizer

Info

Publication number: CN220119365U
Application number: CN202321625137.7U
Authority: CN
Inventors: 徐大宝; 姜思源; 李晓娇; 王志星; 王学文; 崔名双; 杜丽伟; 白小龙; 高源�; 孙虓汉; 赵天晨; 贾楠; 王建朋; 刘鹏中
Original assignee: Beijing Tiandi Sunac Technology Co ltd
Current assignee: Beijing Tiandi Sunac Technology Co ltd
Priority date: 2023-06-25
Filing date: 2023-06-25
Publication date: 2023-12-01
Anticipated expiration: 2033-06-25

Abstract

The utility model relates to a stable burner, which comprises a shell, a coal powder pipe assembly, a secondary air pipe and a concentrating piece, wherein the shell comprises a cavity, the coal powder pipe assembly extends along a first direction, at least part of the coal powder pipe assembly is arranged in the cavity, a first channel and a second channel are arranged in the coal powder pipe assembly at intervals, the first channel and the second channel are communicated with the cavity, and an outlet of the first channel is adjacent to an inlet end of the coal powder pipe assembly relative to an outlet of the second channel; the concentration piece is arranged in the pulverized coal pipe assembly, the concentration piece can divide primary air pulverized coal airflow entering the pulverized coal pipe assembly into first sub-airflows and second sub-airflows, the pulverized coal concentration of the first sub-airflows is smaller than that of the second sub-airflows, the first channel is used for allowing the first sub-airflows to pass through, and the second channel is used for allowing the second sub-airflows to pass through. Therefore, the stable burner provided by the embodiment of the utility model has the advantages of good combustion stability, good environmental protection effect, low production cost and the like.

Description

Flame stabilizer

Technical Field

The utility model relates to the technical field of pulverized coal combustion, in particular to a steady burner.

Background

In the related art, in order to improve the combustion effect of the steady burner, a common ignition device is usually used for ignition, diesel is used as fuel by the common ignition device, and a large amount of diesel is required to be consumed during ignition, so that the operation cost is improved, a large amount of sulfur-containing waste gas is generated, and the environmental protection effect is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides the stable burner with low running cost and good environmental protection effect.

The burner of the embodiment of the utility model comprises:

the shell comprises a cavity, and a mounting port is formed in the shell;

the coal powder pipe assembly extends along a first direction, the first direction comprises a first sub-direction and a second sub-direction opposite to the first sub-direction, the direction from the inlet end of the coal powder pipe assembly to the outlet end of the coal powder pipe assembly is the first sub-direction, at least part of the coal powder pipe assembly is arranged in the cavity, the coal powder pipe assembly is fixed in the shell through a mounting opening, and the outer peripheral wall of the coal powder pipe assembly is in sealing connection with the inner peripheral wall of the mounting opening;

the first channel and the second channel are arranged in the pulverized coal pipe assembly at intervals, the first channel and the second channel are communicated with the cavity, and an outlet of the first channel is adjacent to an inlet end of the pulverized coal pipe assembly relative to an outlet of the second channel;

the concentration piece is arranged in the pulverized coal pipe assembly, the concentration piece can divide primary air pulverized coal flow entering the pulverized coal pipe assembly into a first sub-flow and a second sub-flow, the pulverized coal concentration of the first sub-flow is smaller than that of the second sub-flow, the first channel is used for allowing the first sub-flow to pass through, and the second channel is used for allowing the second sub-flow to pass through;

and the secondary air pipe is communicated with the cavity.

Therefore, the stable burner provided by the embodiment of the utility model has the advantages of good combustion stability, good environmental protection effect, low production cost and the like.

In some embodiments, the pulverized coal pipe assembly comprises a first inlet, a first outlet and a second outlet, the first inlet, the first outlet and the second outlet are all arranged on the pulverized coal pipe assembly and are sequentially and alternately arranged along a first sub-direction, the first inlet and the first outlet are communicated through the first channel, the first inlet and the second outlet are communicated through the second channel, and the openings of the first outlet and the second outlet are all arranged towards the inlet end of the pulverized coal pipe assembly.

In some embodiments, the pulverized coal pipe assembly includes:

a first pipe, wherein the inlet end of the first pipe is provided with the first inlet;

the second pipe, the second pipe with the enrichment spare is all established in the first intraductal, the enrichment spare with the second pipe is in first sub-direction is in proper order and the interval arrangement, the inner peripheral wall of first pipe with the outer peripheral wall of second pipe defines first subchannel, the inner peripheral wall of second pipe defines the second passageway.

In some embodiments, the pulverized coal pipe assembly further comprises:

a first return member which is fitted around the outer peripheral side of the second pipe and is connected to the outlet end of the second pipe, the outlet end of the first pipe extending between the first return member and the second pipe so that the inner peripheral wall of the first return member and the outer peripheral wall of the first pipe define a return passage communicating with the first sub-passage, and the opening of the return passage faces the inlet end of the first pipe to form the first outlet;

the first backflow part and the second backflow part are sequentially and alternately arranged in the first sub-direction, and a part of the second backflow part is sleeved on the outer peripheral side of the first backflow part so as to form the second outlet.

In some embodiments, the first backflow member includes a first cylindrical portion and a first end portion, the first cylindrical portion is sleeved on an outer circumferential side of the first pipe, the first end portion is used for connecting the first cylindrical portion and the second pipe, and the first end portion is disposed at a distance from an end face of an outlet end of the first pipe in the first direction, so that the first sub-channel and the backflow channel are communicated to form the first channel.

In some embodiments, the second backflow member includes a second end portion and a second tube portion, the second end portion and the first end portion are disposed at intervals in the first direction, the second tube portion extends from a surface of the second end portion toward a direction in which the first end portion is located, and the second tube portion is sleeved on an outer peripheral side of the first tube portion such that an opening is formed between an inner peripheral wall of the second tube portion and an outer peripheral wall of the first tube portion toward the second outlet of the inlet end of the pulverized coal tube assembly.

In some embodiments, the housing includes a first section, a second section, a third section, and a fourth section that are sequentially connected in the first direction, the first section and the third section are both cylindrical, a cross-sectional area of the second section gradually increases along the first sub-direction, a cross-sectional area of the fourth section gradually decreases along the first sub-direction, the first outlet is disposed in the second section, and the second outlet is disposed in the third section.

In some embodiments, the secondary air pipe is arranged on the outer peripheral side of the first section and is connected with the first section, and the air outlet direction of the secondary air pipe is tangential to the inner peripheral wall of the first section;

the secondary air pipes are arranged in a plurality, and the secondary air pipes are arranged at intervals along the circumferential direction of the first section.

In some embodiments, the concentrating element is annular and the inner peripheral wall of the concentrating element defines a concentration-regulating channel, the outer peripheral wall of the concentrating element conforms to the inner peripheral wall of the first tube, the concentrating element comprises tapered sections and diverging sections sequentially arranged along the first sub-direction, the cross-sectional area of the tapered sections gradually increases along the first sub-direction, and the cross-sectional area of the diverging sections gradually decreases along the first sub-direction, so that the cross-sectional area of the concentration-regulating channel gradually decreases and then gradually increases along the first sub-direction.

In some embodiments, the second tube is integrally formed with the first reflow.

Drawings

Fig. 1 is a schematic structural view of a stabilizer according to an embodiment of the present utility model.

Fig. 2 is a left side view of fig. 1.

FIG. 3 is a schematic diagram of the internal airflow flow of a stabilizer of an embodiment of the present utility model.

Reference numerals:

a flame stabilizer 100; a pulverized coal pipe assembly 11; a first tube 111; a first inlet 1111; a concentrating member 1112; a tapered section 11121; a diverging section 11122; a second tube 112; a first return 113; a second reflow element 114; a first outlet 115; a second outlet 116; a first channel 117; a second channel 118; a return passage 119; a housing 12; a first section 121; a second section 122; a third section 123; a fourth section 124; a stabilizer outlet 125; secondary air duct 13.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 to 3, the burner according to the embodiment of the present utility model includes a housing 12, a pulverized coal pipe assembly 11, a secondary air pipe 13, and a concentrating element 1112.

The housing 12 includes a cavity, and a mounting opening is provided in the housing 12.

The pulverized coal pipe assembly 11 extends along a first direction, the first direction comprises a first sub-direction and a second sub-direction opposite to the first sub-direction, the direction from the inlet end of the pulverized coal pipe assembly 11 to the outlet end of the pulverized coal pipe assembly 11 is the first sub-direction, at least part of the pulverized coal pipe assembly 11 is arranged in the cavity, the pulverized coal pipe assembly 11 is fixed in the shell 12 through the mounting opening, and the outer peripheral wall of the pulverized coal pipe assembly 11 is in sealing connection with the inner peripheral wall of the mounting opening.

The shell comprises a cavity, and a mounting port is formed in the shell;

the first channel 117 and the second channel 118 are arranged at intervals in the pulverized coal pipe assembly 11, the first channel 117 and the second channel 118 are communicated with the cavity, and an outlet of the first channel 117 is adjacent to an inlet end of the pulverized coal pipe assembly 11 relative to an outlet of the second channel 118.

The concentrating piece 1112 is disposed in the pulverized coal pipe assembly 11, the concentrating piece 1112 can split the primary air pulverized coal flow entering the pulverized coal pipe assembly 11 into a first sub-flow and a second sub-flow, wherein the pulverized coal concentration of the first sub-flow is smaller than that of the second sub-flow, the first channel 117 is used for passing the first sub-flow, and the second channel 118 is used for passing the second sub-flow.

The secondary air duct 13 communicates with the cavity.

For convenience of description, the left-right direction in fig. 1 is hereinafter referred to as a first direction, wherein the right direction is referred to as a first sub-direction, and the left direction is referred to as a second sub-direction.

For example, a cavity is provided in the housing 12, the pulverized coal pipe assembly 11 extends in the left-right direction, the center line of the pulverized coal pipe assembly 11 coincides with the center line of the housing 12, the left end of the pulverized coal pipe assembly 11 is provided outside the housing 12, and the right end of the pulverized coal pipe assembly 11 is provided in the housing 12.

The left end of casing 12 is equipped with the closing plate, and the centre of closing plate is equipped with the installing port, and pulverized coal pipe assembly 11 passes through the installing port to be fixed in casing 12, and the outer periphery wall of pulverized coal pipe assembly 11 and the interior periphery wall sealing connection of installing port. The right end of the housing 12 is provided with a burner stabilizer outlet 125.

A first channel 117 and a second channel 118 are arranged in the pulverized coal pipe assembly 11, the first channel 117 and the second channel 118 are arranged at intervals, the first channel 117 and the second channel 118 are communicated with the cavity, and an outlet of the first channel 117 is arranged on the left side of an outlet of the second channel 118.

The secondary air duct 13 has a secondary air passage therein, which is communicable with the cavity so as to introduce secondary air into the cavity.

When the burner of the embodiment of the utility model works, primary air flow provided by a pulverized coal air source enters the pulverized coal pipe assembly 11, after being concentrated by the concentrating piece 1112, the primary air pulverized coal flow is split into a first sub-air flow and a second sub-air flow, the pulverized coal concentration of the first sub-air flow is smaller than that of the second sub-air flow, the first sub-air flow flows into the cavity from the first channel 117, and the second sub-air flow flows into the cavity from the second channel 118.

Meanwhile, the secondary air is sprayed into the cavity along the secondary air pipe 13 at a high speed, flows rightward gradually in the cavity and forms high-speed rotating airflow, and the secondary air has a large rotating tangential speed at the moment, so that a low-pressure area is formed in the central area of the secondary air in the high-speed rotating flowing process.

As the secondary air flows progressively to the right, a portion of the secondary air flows into the low pressure zone, creating a high velocity recirculation zone within the housing 12.

Because the outlet of the second channel 118 is disposed at a position adjacent to the high-speed backflow area, the second sub-air flow is sprayed at a position adjacent to the high-speed backflow area, so that the second sub-air flow is more easily sucked into the adjacent high-speed backflow area in the flowing process, and part of coal dust in the second sub-air flow is ignited, so that the second sub-air flow can be circularly combusted and released in the adjacent high-speed backflow area, and all coal dust in the second sub-air flow is ignited, so that a concentrated-phase high-temperature backflow area is formed, which is beneficial to promoting the rapid temperature rise and ignition of the second sub-air flow and releasing more heat, so that the coal dust in the concentrated-phase high-temperature backflow area is stably combusted. Meanwhile, the first sub-air flow is sprayed into the cavity at a position with a certain distance on the left side of the second sub-air flow, and the first sub-air flow is blocked and carried by the secondary air in a rotational flow state, so that the direction is turned, and the first sub-air flow enters a concentrated phase high temperature backflow area between the secondary air in the rotational flow state and the second sub-air flow.

In this process, although the pulverized coal concentration in the first sub-stream is low, ignition combustion is not easy, but: on the one hand, the lower concentration pulverized coal in the first sub-air flow is subjected to convection and radiation heat exchange in the high-temperature backflow area, so that the first sub-air flow can be promoted to heat up and catch fire. On the other hand, the outlet position of the first passage 117 is located to the left of the outlet position of the second passage 118 so that the first sub-air flow is to the left of the second sub-air flow when it enters the cavity, thereby allowing the first sub-air flow to have a greater residence time within the housing 12 relative to the second sub-air flow, which together will promote the ignition and burnout effect of the first sub-air flow. At this time, the first sub-air flow is preheated, rapidly heats up and catches fire, and releases more heat, and a dilute phase high temperature reflux zone is formed outside the dense phase high temperature reflux zone.

Meanwhile, the second sub-air flow and the first sub-air flow are sprayed at a certain distance, so that the mixing of the thick air flow and the thin air flow is delayed, the whole burnout is promoted, the thick and thin combustion effect of the pulverized coal is deepened, and the generation of NOx is reduced.

The flame is then ejected at high speed from the stabilizer outlet 125.

The burner of the embodiment of the utility model has the following advantages:

(1) Significant economic advantages.

Compared with the traditional micro-oil igniter and plasma igniter, the utility model has obvious economic advantage. The utility model can realize the effect of igniting most of surrounding coal powder by adopting a small amount of coal powder only by igniting part of coal powder in the second sub-airflow, completely replaces the traditional micro-oil igniter and plasma igniter, adopts coal as fuel to directly ignite, realizes the purpose of igniting a large amount of surrounding coal powder by using a small amount of coal powder, improves the economy of the coal-fired unit in the ignition process and the peak regulation process, and reduces the production cost.

(2) Fast ignition and strong low load stable combustion capability

The utility model is beneficial to quick ignition in the starting process of the coal-fired unit and stable combustion in the flexible peak regulation process by constructing the pulverized coal thick-thin combustion and the secondary pulverized coal ignition preheating in the non-auxiliary combustion stabilizer, and simultaneously promotes the burnout effect in the pulverized coal combustion process.

(3) Reduction of NOx formation

The coal powder thick-thin combustion and two-stage high-temperature reduction zone is built in the non-auxiliary combustion stable burner, so that the generation of fuel type NOx can be reduced. In addition, due to the existence of the multi-stage high-temperature area, the overall temperature distribution in the non-auxiliary combustion stabilizer is more uniform, the generation of thermal NOx is reduced, and the environmental protection effect is improved.

In some embodiments, as shown in fig. 1, the pulverized coal pipe assembly 11 includes a first inlet 1111, a first outlet 115, and a second outlet 116, the first inlet 1111, the first outlet 115, and the second outlet 116 are all disposed on the pulverized coal pipe assembly 11 and are sequentially and alternately disposed along a first sub-direction, the first inlet 1111 and the first outlet 115 are communicated through a first channel 117, the first inlet 1111 and the second outlet 116 are communicated through a second channel 118, and openings of the first outlet 115 and the second outlet 116 are all disposed toward an inlet end of the pulverized coal pipe assembly 11.

For example, the pulverized coal pipe assembly 11 is provided with a first inlet 1111, a first outlet 115 and a second outlet 116, and the three are sequentially arranged along the left-right direction, the first inlet 1111 is disposed on the left side of the pulverized coal pipe assembly 11 and is located outside the housing 12, the first inlet 1111 is communicated with the first outlet 115, and the first inlet 1111 is also communicated with the second outlet 116. The first outlet 115 and the second outlet 116 are both disposed within the housing 12 and are in communication with the cavity.

The openings of the first outlet 115 and the second outlet 116 are each directed to the left, whereby the initial direction of the first and second sub-airflows into the cavity is directed to the left, so as to form a high temperature recirculation zone with the secondary air.

In some embodiments, as shown in fig. 1, the pulverized coal pipe assembly 11 includes a first pipe 111 and a second pipe 112, the inlet end of the first pipe 111 is provided with a first inlet 1111, the second pipe 112 and the concentrating piece 1112 are both provided in the first pipe 111, the concentrating piece 1112 and the second pipe 112 are sequentially and alternately arranged in a first sub-direction, the inner peripheral wall of the first pipe 111 and the outer peripheral wall of the second pipe 112 define a first sub-channel, and the inner peripheral wall of the second pipe 112 defines a second channel 118.

For example, the first tube 111 extends in the left-right direction, the inlet end of the first tube 111 is the left end of the first tube 111, the outlet end of the first tube 111 is the right end of the first tube 111, and the left end of the first tube 111 is open to form the first inlet 1111. The second pipe 112 is provided inside the first pipe 111, and the concentrating piece 1112 is provided on the left side of the second pipe 112 and spaced apart from the second pipe 112. The primary air pulverized coal flow is split into a first sub-flow and a second sub-flow after passing through the concentrating piece 1112. The inner peripheral wall of the first tube 111 is spaced from the outer peripheral wall of the second tube 112 to form a first sub-channel, the inner peripheral wall of the second tube 112 defining a second channel 118. The first outlet 115 is provided to the left of the second outlet 116 such that the first sub-air flow is to the left of the second sub-air flow when the first and second sub-air flows enter the cavity. Thus, the first sub-channel and the second channel 118 are defined by the first tube 111 and the second tube 112 spaced apart, thereby facilitating the flow of pulverized coal through.

Alternatively, the left end of the first tube 111 is disposed to extend leftward out of the housing 12, and the concentrating piece 1112 is located at a portion of the first tube 111 extending out of the housing 12, whereby the concentrating piece 1112 is replaced.

In some embodiments, as shown in fig. 1, the pulverized coal pipe assembly 11 further includes a first backflow member 113 and a second backflow member 114, the first backflow member 113 is sleeved on the outer circumferential side of the second pipe 112 and connected to the outlet end of the second pipe 112, the outlet end of the first pipe 111 extends between the first backflow member 113 and the second pipe 112, such that the inner circumferential wall of the first backflow member 113 and the outer circumferential wall of the first pipe 111 define a backflow channel 119 communicating with the first sub-channel, and the opening of the backflow channel 119 faces the inlet end of the first pipe 111 to form a first outlet 115. The first return member 113 and the second return member 114 are arranged in order and at intervals in the first sub-direction, and a part of the second return member 114 is fitted over the outer peripheral side of the first return member 113 so as to form a second outlet 116.

For example, the outlet end of the second pipe 112 is the right end of the second pipe 112, the first backflow member 113 is connected to the right end of the second pipe 112 and is sleeved on the outer peripheral side of the second pipe 112, the outlet end of the first pipe 111 is the right end of the first pipe 111, the right end of the first pipe 111 is located between the first backflow member 113 and the second pipe 112, the outer peripheral wall of the first pipe 111 and the inner peripheral wall of the first backflow member 113 are arranged at intervals to form a backflow channel 119, and the right end surface of the first pipe 111 and the right end of the first backflow portion are arranged at intervals, so that the backflow channel 119 and the first sub-channel can be communicated. The return channel 119 opens to the left to form the first outlet 115.

The second return member 114 is provided on the right side of the first return member 113, and a part of the second return member 114 is fitted over the outer peripheral side of the first return member 113 so that a second outlet 116 is formed between the inner peripheral wall of the second return member 114 and the outer peripheral wall of the first return member 113 with the opening facing the left.

Thus, the first sub-stream, after entering the first sub-channel, is blocked by the first return member 113 to be deflected into the return channel 119 and discharged from the first outlet 115. The second sub-stream, after entering the second passageway 118, is blocked by the second return 114 and deflected out of the second outlet 116. The burner of the embodiment of the utility model utilizes the first backflow piece 113 and the second backflow piece 114 to enable the initial flow directions of the first sub-air flow and the second sub-air flow entering the cavity to face to the left, thereby being convenient for forming a high-temperature combustion area and further improving the stability of the burner.

In some embodiments, as shown in fig. 1, the first return 113 includes a first cylindrical portion that is fitted around the outer circumferential side of the first pipe 111, and a first end portion for connecting the first cylindrical portion and the second pipe 112, the first end portion being disposed at a distance from an end face of an outlet end of the first pipe 111 in the first direction so as to communicate the first sub-passage and the return passage 119 to form a first passage 117.

For example, the first end portion is a ring-shaped plate-like member, an inner peripheral wall of the first end portion is connected to the second tube 112, an outer peripheral wall of the second end portion is connected to the first tube portion, and the first tube portion extends leftward from a left side of the first end portion. The outlet end of the first tube 111 is the right end of the first tube 111, and the right end of the first tube 111 is spaced from the first end so that the first sub-channel communicates with the return channel 119 to form the first channel 117.

Therefore, the first backflow member 113 of the stabilizer of the embodiment of the utility model has a simple structure and is convenient to process.

In some embodiments, as shown in fig. 1, the second backflow member 114 includes a second end portion and a second cylindrical portion, the second end portion and the first end portion are disposed at intervals in the first direction, the second cylindrical portion extends from a surface of the second end portion toward the direction in which the first end portion is located, and the second cylindrical portion is sleeved on an outer circumferential side of the first cylindrical portion such that a second outlet 116, which is open toward an inlet end of the pulverized coal pipe assembly 11, is formed between an inner circumferential wall of the second cylindrical portion and an outer circumferential wall of the first cylindrical portion.

For example, the second end portion is a circular plate-like member, the second tube portion extends leftward from the left side of the second end portion, and is fitted around the outer peripheral wall of the first tube portion, the first tube portion and the second tube portion are disposed at intervals to form the second outlet 116, and the opening of the second outlet 116 is directed leftward.

In some embodiments, as shown in fig. 1, the housing 12 includes a first section 121, a second section 122, a third section 123, and a fourth section 124 sequentially connected in a first direction, the secondary air duct 13 is connected to the first section 121, the first section 121 and the third section 123 are each cylindrical, the cross-sectional area of the second section 122 gradually increases in a first sub-direction, the cross-sectional area of the fourth section 124 gradually decreases in the first sub-direction, the first outlet 115 is provided in the second section 122, and the second outlet 116 is provided in the third section 123.

For example, the first section 121, the second section 122, the third section 123 and the fourth section 124 are sequentially arranged in the left-to-right direction, the secondary air duct 13 is provided on the outer peripheral side of the first section 121, the first section 121 and the third section 123 are each cylindrical, in other words, the cross-sectional areas of the first section 121 and the third section 123 are unchanged, the cross-sectional area of the second section 122 is gradually increased in the left-to-right direction, and the cross-sectional area of the fourth section 124 is gradually decreased in the left-to-right direction. The right end of the fourth section 124 is provided with a flame stabilizer outlet 125, and the fourth section 124 can gather the flame in the flame stabilizer to increase the speed of the flame.

In the burner according to the embodiment of the present utility model, since the cross-sectional area of the second section 122 is gradually increased from left to right, the flow rate of the secondary air is reduced while the static pressure is gradually increased during the flow of the secondary air through the second section 122, so that a high recirculation zone is formed.

In some embodiments, as shown in fig. 1 and 2, the secondary air duct 13 is disposed at the outer peripheral side of the first section 121 and connected to the first section 121, and the air outlet direction of the secondary air duct 13 is tangential to the inner peripheral wall of the first section 121. The secondary air duct 13 is plural, and the plural secondary air ducts 13 are arranged at intervals along the circumferential direction of the first section 121.

For example, the secondary air duct 13 is provided on the outer peripheral side of the first section 121 and is connected to the first section 121, and the air outlet direction of the secondary air duct 13 is tangential to the inner peripheral wall of the first section 121, in other words, a secondary air duct is provided in the secondary air duct 13, and the secondary air duct is tangential to the inner peripheral wall of the first section 121. The secondary air duct 13 has a plurality of, for example, two to six, etc. Alternatively, the secondary air duct 13 is two, three or six.

According to the burner disclosed by the embodiment of the utility model, the air outlet direction of the secondary air pipe 13 is tangential to the inner peripheral wall of the shell 12, so that the secondary air flows in a high-speed rotating way, and a low-pressure area is formed in the central area of the secondary air.

In some embodiments, as shown in fig. 1, the concentrating member 1112 is annular and the inner peripheral wall of the concentrating member 1112 defines a concentration-adjusting channel, the outer peripheral wall of the concentrating member 1112 is fitted with the inner peripheral wall of the first tube 111, the concentrating member 1112 includes a tapered section 11121 and a diverging section 11122 sequentially arranged along a first sub-direction, the cross-sectional area of the tapered section 11121 gradually increases along the first sub-direction, and the cross-sectional area of the diverging section 11122 gradually decreases along the first sub-direction, so that the cross-sectional area of the concentration-adjusting channel gradually decreases first and then gradually increases along the first sub-direction.

For example, the concentrating piece 1112 is an annular piece, the middle of the concentrating piece 1112 is provided with a concentration adjusting channel, and the primary air pulverized coal flow can pass through the concentration adjusting channel, and the outer peripheral wall of the concentrating piece 1112 is attached to the inner peripheral wall of the first tube 111, so that the primary air pulverized coal flow can only pass through the concentration adjusting channel. The tapered section 11121 is disposed on the left side of the tapered section 11122, the tapered section 11121 is disposed adjacent to the first outlet 115, and the tapered section 11121 is annular in cross section, the tapered section 11121 gradually increasing in cross section in a left-to-right direction, such that a portion of the concentration-adjusting passage defined by the inner peripheral wall of the tapered section 11121 gradually decreases in cross section in the left-to-right direction.

The cross section of the diverging section 11122 is also annular, and the cross sectional area of the diverging section 11122 gradually decreases in the left-to-right direction, so that the cross sectional area of a portion of the concentration-adjusting passage defined by the inner peripheral wall of the diverging section 11122 gradually increases in the left-to-right direction.

When the burner of the embodiment of the utility model works, the primary air pulverized coal airflow meets the concentrating piece 1112 at first, in the process of impacting the concentrating piece 1112, the pulverized coal particles in the primary air pulverized coal airflow gradually gather near the central line of the first pipe 111 in the tapered section 11121, so that the pulverized coal concentration near the central line of the first pipe 111 gradually increases, and in the tapered section 11122, the primary air pulverized coal airflow gradually diffuses near the pipe wall of the first pipe 111, and due to the short distance between the concentrating piece 1112 and the second pipe 112, the primary air pulverized coal airflow does not have enough time to diffuse near the pipe wall of the first pipe 111, so that the pulverized coal concentration near the pipe wall of the first pipe 111 reaches the pulverized coal concentration near the central line of the first pipe 111.

Accordingly, when the primary air pulverized coal flow passes through the concentration adjustment passage, the primary air pulverized coal flow undergoes the effect of inertial separation to be subjected to the separation of the concentration, so that a first sub-flow having a low pulverized coal concentration is formed near the inner wall surface of the first tube 111, a second sub-flow having a high pulverized coal concentration is formed near the center line of the first tube 111, and then the first sub-flow enters the first passage 117 outside the second tube 112, and the second sub-flow enters the second passage 118 inside the second tube 112.

In some embodiments, as shown in FIG. 1, the second tube 112 is integrally formed with the first reflow member 113. Thereby, the second pipe 112 and the first return 113 facilitate processing.

The specific operation of the present utility model will be described with reference to fig. 1-3.

The primary air pulverized coal airflow sequentially enters the pulverized coal pipe assembly 11 through the first inlet 1111. The primary air pulverized coal airflow first meets the concentrating piece 1112, pulverized coal particles in the primary air pulverized coal airflow are subjected to inertial separation in the process of impacting the concentrating piece 1112, so that the primary air pulverized coal airflow is subjected to concentration separation, pulverized coal is gathered near the central line of the first pipe 111, a first sub-airflow with lower pulverized coal concentration is formed near the inner wall surface of the first pipe 111, and a second sub-airflow with higher pulverized coal concentration is formed near the central line of the first pipe 111.

Then, after the first sub-air flows into the first channel 117, the first sub-air flows out from the first outlet 115 and flows into the second section 122 along the direction from right to left under the action of the first backflow member 113. The second sub-air flow enters the second passage 118 and, under the influence of the second return 114, flows in a right-to-left direction into the third section 123 and gradually flows to the left to the second section 122.

At the same time, the secondary air is injected into the cavity along the secondary air duct 13 at a high speed, a high-speed rotating air flow is formed in the first section 121, and flows into the area near the inner wall surface of the second section 122, and the secondary air has a large tangential rotational speed at this time, so that a low-pressure area is formed in the central area of the secondary air during the high-speed rotating flow of the secondary air. Further, since the cross-sectional area of the second section 122 gradually increases from left to right, the flow rate of the secondary air decreases while the static pressure gradually increases during the flow of the secondary air through the second section 122.

In summary, a low-pressure area is formed in the central area of the secondary air, the flow rate of the secondary air is reduced, and the static pressure is gradually increased, and under the action of the two factors, when the secondary air gradually flows rightward, part of the secondary air flows into the low-pressure area, so that a high-speed backflow area is formed in the second section 122 and the third section 123.

Because the second outlet 116 is disposed adjacent to the high-speed backflow region, the second sub-air flow is sprayed in the position adjacent to the high-speed backflow region, so that the second sub-air flow is more easily sucked into the adjacent high-speed backflow region in the flowing process, and the second sub-air flow is whirled and combusted to release heat in the adjacent high-speed backflow region, thereby forming a dense-phase high-temperature backflow region, which is beneficial to promoting the rapid temperature rise and ignition of the second sub-air flow and releasing more heat to form the dense-phase high-temperature backflow region.

Meanwhile, the first sub-air flow is sprayed into the position with a certain distance on the left side of the second sub-air flow, and the first sub-air flow is blocked and carried by the secondary air in a rotational flow state, so that the direction is turned, and the first sub-air flow enters a concentrated phase high temperature backflow area between the secondary air in the rotational flow state and the second sub-air flow.

In this process, although the pulverized coal concentration in the first sub-stream is low, ignition combustion is not easy, but: on the one hand, the lower concentration pulverized coal in the first sub-air flow is subjected to convection and radiation heat exchange in the high-temperature backflow area, so that the first sub-air flow can be promoted to heat up and catch fire. On the other hand, the first outlet 115 is disposed to the left of the second outlet 116 such that the first sub-air flow has a greater residence time within the housing 12 than the second sub-air flow, which together promote ignition and burnout effects of the first sub-air flow. At this time, the first sub-air flow is subjected to primary preheating, rapid temperature rise and ignition, and releases more heat to form a dilute phase high temperature reflux zone.

Then, the airflows in the high-temperature dense-phase backflow area and the high-temperature dilute-phase backflow area form a primary flame, and the primary flame is ejected out from the burner outlet 125 at a high speed after the primary flame is subjected to the gathering acceleration action of the fourth section 124.

The utility model has the following advantages:

(1) Significant economic advantage

Compared with the traditional micro-oil igniter and plasma igniter, the utility model has obvious economic advantage. The coal-fired unit can realize the effect of igniting most of surrounding coal powder by using a small amount of coal powder, completely replace the traditional micro-oil igniter and plasma igniter, directly ignite by using coal as fuel, realize the purpose of igniting a large amount of surrounding coal powder by using a small amount of coal powder, and improve the economy of the coal-fired unit in the ignition process and the peak shaving process.

(2) Fast ignition and strong low load stable combustion capability

The utility model couples the ignition and stable combustion strengthening measures of multi-stage pulverized coal concentration and multi-stage pulverized coal preheating, and sequentially ignites downstream pulverized coal airflow by constructing pulverized coal thick-thin combustion and secondary pulverized coal ignition preheating in the non-auxiliary stable combustion device and constructing multi-stage (three-stage or more) pulverized coal preheating downstream of the non-auxiliary stable combustion device. The method is favorable for quick ignition in the starting process of the coal-fired unit, stable combustion in the flexible peak regulation process and simultaneously promotes the burnout effect in the coal powder combustion process.

(3) Low NOx generation

The multi-stage strong reduction atmosphere along the flame high temperature region is formed by constructing a coal dust thick-thin combustion and two-stage high temperature reduction region inside the non-auxiliary combustion stable burner and constructing a multi-stage thick-thin combustion at the downstream of the outlet of the non-auxiliary combustion stable burner, thereby being beneficial to reducing the generation of fuel type NOx. In addition, due to the existence of the multi-stage high-temperature area, the whole temperature distribution in the combustion-supporting-free steady burner is more uniform, and the generation of thermal NOx is reduced.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims

1. A flame stabilizer, comprising:

the shell comprises a cavity, and a mounting port is formed in the shell;

and the secondary air pipe is communicated with the cavity.

2. The steady burner of claim 1, wherein the pulverized coal pipe assembly comprises a first inlet, a first outlet and a second outlet, the first inlet, the first outlet and the second outlet are all disposed on the pulverized coal pipe assembly and are sequentially and alternately arranged along a first sub-direction, the first inlet and the first outlet are communicated through the first channel, the first inlet and the second outlet are communicated through the second channel, and the openings of the first outlet and the second outlet are all disposed toward an inlet end of the pulverized coal pipe assembly.

3. The burner of claim 2, wherein the pulverized coal pipe assembly comprises:

4. The burner of claim 3, wherein the pulverized coal pipe assembly further comprises:

5. The burner of claim 4, wherein the first return member includes a first cylindrical portion and a first end portion, the first cylindrical portion being fitted around an outer peripheral side of the first pipe, the first end portion being for connecting the first cylindrical portion and the second pipe, the first end portion being disposed at a distance from an end face of an outlet end of the first pipe in the first direction so that the first sub-passage and the return passage communicate to form the first passage.

6. The burner of claim 5, wherein the second return member includes a second end portion and a second cylindrical portion, the second end portion and the first end portion being disposed at intervals in the first direction, the second cylindrical portion extending from a surface of the second end portion toward a direction in which the first end portion is located, the second cylindrical portion being fitted around an outer peripheral side of the first cylindrical portion such that an opening is formed between an inner peripheral wall of the second cylindrical portion and an outer peripheral wall of the first cylindrical portion toward the second outlet of the inlet end of the pulverized coal pipe assembly.

7. The burner of any one of claims 2-6, wherein the housing comprises a first section, a second section, a third section, and a fourth section that are sequentially connected in the first direction, the first section and the third section each being cylindrical, the cross-sectional area of the second section increasing progressively along the first sub-direction, the cross-sectional area of the fourth section decreasing progressively along the first sub-direction, the first outlet being disposed within the second section, and the second outlet being disposed within the third section.

8. The burner of claim 7, wherein the secondary air duct is disposed on the outer peripheral side of the first section and is connected to the first section, and the air outlet direction of the secondary air duct is tangential to the inner peripheral wall of the first section;

9. A burner as claimed in claim 3, wherein the thickening member is annular and the inner peripheral wall of the thickening member defines a concentration-regulating passage, the outer peripheral wall of the thickening member being in contact with the inner peripheral wall of the first tube, the thickening member comprising tapered sections and diverging sections arranged in sequence along the first sub-direction, the cross-sectional area of the tapered sections progressively increasing along the first sub-direction, the cross-sectional area of the diverging sections progressively decreasing along the first sub-direction such that the cross-sectional area of the concentration-regulating passage progressively decreases first and then progressively increases along the first sub-direction.

10. The burner of claim 4, wherein the second tube is integrally formed with the first return.