CN209876911U - Large coal powder concentration ratio delay mixed type rotational flow coal powder burner - Google Patents
Large coal powder concentration ratio delay mixed type rotational flow coal powder burner Download PDFInfo
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- CN209876911U CN209876911U CN201920207833.3U CN201920207833U CN209876911U CN 209876911 U CN209876911 U CN 209876911U CN 201920207833 U CN201920207833 U CN 201920207833U CN 209876911 U CN209876911 U CN 209876911U
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- 239000003245 coal Substances 0.000 title claims abstract description 188
- 239000000843 powder Substances 0.000 title claims abstract description 51
- 238000005192 partition Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitrogen oxide Substances O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 239000002817 coal dust Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
The utility model relates to a large pulverized coal concentration ratio postponed mixed rotational flow pulverized coal burner, which comprises a main body formed by sleeving a fresh pulverized coal airflow pipe, a conical pipe, a cylindrical pulverized coal concentration chamber, a cylindrical inner secondary air channel and a cylindrical outer secondary air channel in sequence from inside to outside, wherein the lower opening of the fresh pulverized coal airflow pipe, namely a discharge opening, is in a horn shape; the primary air inlet and coal powder feeding channel is connected to the upper part of the side wall of the cylindrical coal powder concentration chamber in a manner of being tangent to the cylindrical coal powder concentration chamber; a circle of thick blades are arranged at the lower part of the inner secondary air channel cavity, and a circle of thin blades are arranged at the lower part of the outer secondary air channel cavity; a conical shunt body is arranged at the center of the bell mouth. The utility model discloses an organize buggy heightHigh combustion efficiency and NO content x Low generation amount, low-load stable combustion capability and strong adaptability of coal types.
Description
Technical Field
The utility model relates to a coal fired boiler pulverized coal burner, concretely relates to promotion buggy catches fire, burns up, reduces NO x The large pulverized coal concentration ratio delay mixed rotational flow pulverized coal burner which generates and stably burns with low load has high combustion efficiency and NO x Low generation amount, low-load stable combustion capability and strong adaptability of coal types.
Background
In the total amount of fossil energy resources which have been proved in China, coal accounts for more than 90 percent, and the coal resources are rich and have the characteristic of diversified coal types. From the perspective of guaranteeing stable national energy supply and maintaining national energy safety, the energy structure mainly based on coal in short term in China cannot be changed. It is also noted that combustion remains the primary means of coal utilization. The combustion mode of the pulverized coal occupies a large proportion in power devices in the power industry and other industries. Nitrogen Oxides (NO) x ) Is a precursor for acid rain and photochemical pollution, while coal combustion produces NO x Is the main source of (1). With the increasing demand for pollutant abatement, countries have established strict standards to limit the NO produced by large combustion plantsxAnd (5) discharging. In addition, under the pressure of ever-increasing environmental issues, renewable energy utilization has become the best choice for power systems, and the rapid development of renewable energy power generation and compatibility problems of coal-fired power plants, especially the problem of low-load stable combustion of boilers, are attracting more and more attention.
In order to respond to the increasingly severe environmental protection standard of China, rich and variable coal resources are scientifically utilized, and the flexibility is enhancedLow-load stable combustion ability of boiler under large trend of active peak regulation, development of high-efficiency and low NO x The pulverized coal burner with wide coal type adaptability and strong low-load stable combustion capability plays an important role in promoting the continuous development of the coal-fired boiler under the new situation.
Disclosure of Invention
To promote the pulverized coal of the pulverized coal boiler to be ignited and burnt out and reduce NO x Generate and strengthen the low-load and steady burning capacity, the utility model provides a mixed whirl pulverized coal burner is postponed to concentrated ratio of big buggy.
The purpose of the utility model is realized like this: the main body of the burner is cylindrical and is formed by sequentially sleeving a light coal powder airflow pipe, a conical pipe, a cylindrical coal powder concentration chamber, a cylindrical inner secondary air channel and a cylindrical outer secondary air channel from inside to outside, wherein the vertex of the conical pipe is arranged above and is connected with the upper end of the light coal powder airflow pipe, the cylindrical coal powder concentration chamber has the highest height and is provided with an upper cover, the inner secondary air channel and the outer secondary air channel are both annular cavities, the air inlets and the air outlets of the inner secondary air channel and the outer secondary air channel are arranged at the upper part and the lower part of the annular cavities, and the lower opening, namely the discharge outlet, of the; the primary air inlet and coal powder feeding channel is a horizontal cylindrical channel and is connected to the upper part of the side wall of the cylindrical coal powder concentration chamber in a manner of being tangent to the cylindrical coal powder concentration chamber; a circle of thick blades are arranged at the lower part of the inner secondary air channel cavity, and each thick blade is uniformly fixed on the outer side of the side wall of the cylindrical pulverized coal concentrating chamber; a circle of partition plates are fixed on the outer side surface of the side wall of the inner secondary air channel, a circle of thin blades are arranged at the lower part of the cavity of the outer secondary air channel, and each thin blade is uniformly fixed on the circle of partition plates; the outlet angles of the thin and thick blades are both 10-70 degrees, and the thin and thick are the comparison of the thickness between the two blades; the center of the bell mouth is provided with a cone-shaped shunt body which is fixed on the bell mouth by a radial support.
The working process is as follows: the air-carried pulverized coal (primary air pulverized coal airflow) enters the pulverized coal concentration chamber from the primary air inlet channel and the pulverized coal feeding channel along the tangential direction, the primary air pulverized coal airflow rotates at a high speed in the pulverized coal concentration chamber, and due to the fact that the density of pulverized coal particles is high, the centrifugal force applied in the rotating process of the pulverized coal particles is far larger than that of air, most of the pulverized coal particles gradually migrate and gather to the wall surface area of the pulverized coal concentration chamber in the high-speed rotating process, and flow downwards through the annular concentrated pulverized coal airflow channel, and therefore the concentrated pulverized coal airflow with high pulverized coal concentration is formed. Because the primary air pulverized coal airflow rotates at a high speed in the pulverized coal concentration chamber, the concentrated pulverized coal airflow is still kept at a certain rotational flow speed after being sprayed out from the concentrated pulverized coal airflow channel. The airflow pulverized coal concentration in the central area of the pulverized coal concentration chamber is low, and the airflow pulverized coal is sprayed out from a light pulverized coal airflow channel positioned in the center of the pulverized coal concentration chamber close to direct current, so that a light pulverized coal airflow with low pulverized coal concentration is formed, and meanwhile, the light pulverized coal airflow is sprayed out from a horn shape under the combined action of the flaring of the light pulverized coal airflow pipe and the conical blunt body.
The swirl pulverized coal concentration mode can realize high-efficiency concentration of pulverized coal, the pulverized coal concentration in a light pulverized coal airflow after pulverized coal concentration and dilution separation accounts for ~% of the total pulverized coal amount, the air amount in a light pulverized coal airflow accounts for ~% of the total air amount in a primary air pulverized coal airflow, the pulverized coal concentration in a thick pulverized coal airflow accounts for ~% of the total pulverized coal amount, the air amount in a thick pulverized coal airflow accounts for ~% of the total air amount in a primary air pulverized coal airflow, and after the thick and thin pulverized coal airflow is sprayed out, a swirl thick pulverized coal airflow wraps a direct-flow light pulverized coal airflow to form a flow pattern.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the ignition, stable combustion and burnout of the pulverized coal are promoted under various coal types and variable load conditions.
(1) The cyclone separation principle is adopted to concentrate primary air pulverized coal airflow, so that the high pulverized coal concentration efficiency is achieved, the high pulverized coal concentration is achieved, the pulverized coal concentration in the high-concentration pulverized coal airflow is beneficial to reducing the ignition heat of the pulverized coal, and the timely ignition of the pulverized coal is promoted.
(2) The concentrated coal dust airflow, the inner secondary air and the outer secondary air are all sprayed out in a rotational flow at a high speed, so that a stable low-pressure backflow area is constructed at an outlet area of the burner, high-temperature flue gas generated in the combustion process of the coal dust is sucked in a rolling mode, coal dust particles are further heated, and the temperature rise and stable combustion of the coal dust are facilitated.
(3) The light coal powder airflow is arranged in the central area of the burner, although the concentration of coal powder of the light coal powder airflow is low, the thick coal powder airflow wraps the light coal powder airflow to burn, so that the light coal powder airflow is influenced by the heat released by the burning of the thick coal powder airflow, and the temperature rise, the ignition and the burnout of the coal powder in the light coal powder airflow are facilitated.
(4) The light coal powder airflow is ejected out from the light coal powder airflow channel in an umbrella shape at low speed, which is beneficial to stabilizing a low-pressure backflow zone formed at the outlet area of the burner and is beneficial to the stable combustion of the coal powder.
2. NO inhibition under variable load conditions with multiple coal types x And (4) generating.
(1) The concentrated coal dust airflow contains high coal dust concentration, is beneficial to the combustion of the coal dust in a strong reduction atmosphere at the initial combustion stage, and inhibits NO at the initial ignition stage of the coal dust x And (4) generating.
(2) The thick coal powder air flow channel and the thin coal powder air flow channel are separated by a certain distance, so that after the thick coal powder air flow and the thin coal powder air flow are sprayed out, the mixing between the thick coal powder air flow and the thin coal powder air flow is delayed, the thick-thin graded combustion effect of the coal powder is enhanced, and NO is inhibited x And (4) generating.
(3) By arranging of greater thicknessThe inner secondary air blade is used for constructing a long and narrow inner secondary air flow channel with a larger ratio of the radial dimension to the tangential dimension of the cross section, so that after the inner secondary air is sprayed out, the inner secondary air has a smaller contact area with pulverized coal airflow in a central area, the inner secondary air is gradually mixed with the pulverized coal airflow in a flowing process, a strong reduction atmosphere in a pulverized coal combustion process is constructed, and NO is inhibited x And (4) generating.
(4) A baffle ring is arranged between the inner secondary air and the outer secondary air, so that the inner secondary air and the outer secondary air keep a certain distance after being sprayed out, and the mixing of the airflow of the outer secondary air, the airflow of the inner secondary air and the airflow of the central coal powder is delayed, thereby further deepening the air staged combustion effect, enabling the coal powder to be combusted in a strong reducing atmosphere all the time, and inhibiting NO x And (4) generating.
Drawings
Fig. 1 is a schematic axial section of the present invention, wherein a primary air inlet and pulverized coal feeding channel are provided.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a sectional view taken along line a-a of fig. 1.
Fig. 4 is a sectional view taken along line B-B of fig. 1.
Fig. 5 is a perspective view of the outer secondary air thin blade.
Fig. 6 is a perspective view of the inner secondary thick wind blade.
Fig. 7 is a perspective view of the utility model when two primary air inlets and a coal powder feeding channel are arranged.
Fig. 8 is a schematic view of the present invention in operation.
Description of the reference numerals
1: primary air inlet and pulverized coal feeding channel
2: coal powder concentrating chamber
3: inner secondary air channel
4: outer secondary air channel
5: conical tube
6: light coal powder airflow pipe
7: thick blade
8: thin blade
9: one-circle separator
10: dense coal powder air flow channel
12: horn mouth
13: light coal powder air flow channel
14: conical shunt body
15: cylinder fixing rib
16: a radial support.
Detailed Description
The first embodiment. Referring to fig. 1 and 3, the main body of the burner is cylindrical and is formed by sleeving a light coal powder airflow pipe 6, a conical pipe 5, a cylindrical coal powder concentration chamber 2, a cylindrical inner secondary air channel 3 and a cylindrical outer secondary air channel 4 from inside to outside in sequence, wherein the vertex of the conical pipe is positioned at the upper part and is connected with the upper end of the light coal powder airflow pipe, the cylindrical coal powder concentration chamber has the highest height and is provided with an upper cover, the inner secondary air channel and the outer secondary air channel are both annular cavities, the air inlet and the air outlet of the inner secondary air channel are positioned at the upper part and the lower part of the annular cavity, and the lower opening, namely the discharge opening, of the; referring to fig. 2, a primary air inlet and pulverized coal feeding channel 1 is a horizontal cylindrical channel and is connected to the upper part of the side wall of a cylindrical pulverized coal concentrating chamber in a manner of being tangent to the cylindrical pulverized coal concentrating chamber; referring to fig. 5 and 6, a circle of thick blades 7 is arranged at the lower part of the inner secondary air channel cavity, and each thick blade is uniformly fixed on the outer side of the side wall of the cylindrical pulverized coal concentrating chamber; a circle of partition plates 9 are fixed on the outer side surface of the side wall of the inner secondary air channel, a circle of thin blades 8 are arranged at the lower part of the cavity of the outer secondary air channel, and each thin blade is uniformly fixed on one circle of partition plates; the outlet angle of each of the thin and thick blades is 10-70 degrees, and the thin and thick refers to the comparison of the thickness between the two blades; a conical shunt body 14 is arranged in the centre of the bell (see fig. 4) and is fixed to the bell by a Y-shaped radial support 16. 15 is a cylinder fixing body fixed between the conical tube and the cylindrical coal dust concentration chamber.
Referring to fig. 8, the working process is: the air-carried pulverized coal (primary air pulverized coal airflow) enters the pulverized coal concentration chamber from the primary air inlet channel and the pulverized coal feeding channel along the tangential direction, the primary air pulverized coal airflow rotates at a high speed in the pulverized coal concentration chamber, and due to the fact that the density of pulverized coal particles is high, the centrifugal force applied in the rotating process of the pulverized coal particles is far larger than that of air, most of the pulverized coal particles gradually migrate and gather to the wall surface area of the pulverized coal concentration chamber in the high-speed rotating process, and flow out downwards through the annular concentrated pulverized coal airflow channel 10, and therefore concentrated pulverized coal airflow with high pulverized coal concentration is formed. Because the primary air pulverized coal airflow rotates at a high speed in the pulverized coal concentration chamber, the concentrated pulverized coal airflow is still kept at a certain rotational flow speed after being sprayed out from the concentrated pulverized coal airflow channel. The airflow pulverized coal in the central area of the pulverized coal concentrating chamber has low concentration, and is sprayed out from a light pulverized coal airflow channel 13 positioned in the center of the pulverized coal concentrating chamber close to direct current, so that light pulverized coal airflow with low pulverized coal concentration is formed, and meanwhile, the light pulverized coal airflow is sprayed out from a horn shape under the combined action of the flaring of the light pulverized coal airflow pipe and the conical blunt body.
The swirl pulverized coal concentration mode can realize high-efficiency concentration of pulverized coal, the pulverized coal concentration in a light pulverized coal airflow after pulverized coal concentration and dilution separation accounts for ~% of the total pulverized coal amount, the air amount in a light pulverized coal airflow accounts for ~% of the total air amount in a primary air pulverized coal airflow, the pulverized coal concentration in a thick pulverized coal airflow accounts for ~% of the total pulverized coal amount, the air amount in a thick pulverized coal airflow accounts for ~% of the total air amount in a primary air pulverized coal airflow, and after the thick and thin pulverized coal airflow is sprayed out, a swirl thick pulverized coal airflow wraps a direct-flow light pulverized coal airflow to form a flow pattern.
Example two. The above is an embodiment of a single primary air inlet and pulverized coal feed channel. The utility model discloses can also set up two wind air inlets and buggy feedstock channel. Referring to fig. 7, the two primary air inlet channels and the pulverized coal feeding channel are arranged in an axisymmetric tangential manner, and the rest is the same as the first embodiment.
Claims (3)
1. A mixed rotational flow pulverized coal burner with a delay large pulverized coal concentration ratio is characterized in that: the main body of the burner is cylindrical and is formed by sequentially sleeving a light coal powder airflow pipe, a conical pipe, a cylindrical coal powder concentration chamber, a cylindrical inner secondary air channel and a cylindrical outer secondary air channel from inside to outside, wherein the vertex of the conical pipe is arranged above and is connected with the upper end of the light coal powder airflow pipe, the cylindrical coal powder concentration chamber has the highest height and is provided with an upper cover, the inner secondary air channel and the outer secondary air channel are both annular cavities, the air inlets and the air outlets of the inner secondary air channel and the outer secondary air channel are arranged at the upper part and the lower part of the annular cavities, and the lower opening, namely the discharge outlet, of the;
the primary air inlet and coal powder feeding channel is a horizontal cylindrical channel and is connected to the upper part of the side wall of the cylindrical coal powder concentration chamber in a manner of being tangent to the cylindrical coal powder concentration chamber; a circle of thick blades are arranged at the lower part of the inner secondary air channel cavity, and each thick blade is uniformly fixed on the outer side of the side wall of the cylindrical pulverized coal concentrating chamber; a circle of partition plates are fixed on the outer side surface of the side wall of the inner secondary air channel, a circle of thin blades are arranged at the lower part of the cavity of the outer secondary air channel, and each thin blade is uniformly fixed on the circle of partition plates; the outlet angles of the thin and thick blades are both 10-70 degrees, and the thin and thick are the comparison of the thickness between the two blades; the center of the bell mouth is provided with a cone-shaped shunt body which is fixed on the bell mouth by a radial support.
2. The pulverized coal concentration ratio delay hybrid cyclone pulverized coal burner as claimed in claim 1, wherein: the cone-shaped shunt body is fixed on the bell mouth by a Y-shaped radial support.
3. The large pulverized coal concentration ratio delay hybrid cyclone pulverized coal burner as claimed in claim 1 or 2, characterized in that: the primary air inlet channel and the pulverized coal feeding channel are two and are arranged in an axisymmetric tangential manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207833.3U CN209876911U (en) | 2019-02-19 | 2019-02-19 | Large coal powder concentration ratio delay mixed type rotational flow coal powder burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207833.3U CN209876911U (en) | 2019-02-19 | 2019-02-19 | Large coal powder concentration ratio delay mixed type rotational flow coal powder burner |
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| Publication Number | Publication Date |
|---|---|
| CN209876911U true CN209876911U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920207833.3U Withdrawn - After Issue CN209876911U (en) | 2019-02-19 | 2019-02-19 | Large coal powder concentration ratio delay mixed type rotational flow coal powder burner |
Country Status (1)
| Country | Link |
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| CN (1) | CN209876911U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737393A (en) * | 2019-02-19 | 2019-05-10 | 沈阳环境科学研究院 | Big Pulverized Coal Concentration is than postponing hybrid vortex burner |
-
2019
- 2019-02-19 CN CN201920207833.3U patent/CN209876911U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737393A (en) * | 2019-02-19 | 2019-05-10 | 沈阳环境科学研究院 | Big Pulverized Coal Concentration is than postponing hybrid vortex burner |
| CN109737393B (en) * | 2019-02-19 | 2024-02-27 | 沈阳环境科学研究院 | Large coal powder concentration ratio postpone mixed type cyclone coal powder burner |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20191231 Effective date of abandoning: 20240227 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20191231 Effective date of abandoning: 20240227 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |