CN109028039B - Coal dust depth concentration device and combustion method - Google Patents
Coal dust depth concentration device and combustion method Download PDFInfo
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- CN109028039B CN109028039B CN201810851875.0A CN201810851875A CN109028039B CN 109028039 B CN109028039 B CN 109028039B CN 201810851875 A CN201810851875 A CN 201810851875A CN 109028039 B CN109028039 B CN 109028039B
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- breeze airflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/24—Disposition of burners to obtain a loop flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
- F23C2201/10—Furnace staging
- F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
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- General Engineering & Computer Science (AREA)
Abstract
Coal dust depth concentration device and combustion method.Boiler minimum steady fires ability, is influenced by factors such as coal quality fugitive constituent, moisture, ash, fineness of pulverized coal, pulverized coal fineness, burner types, air distributions.Under low loading conditions, since flame heat regulating is spread rapidly, flame temperature sharp-decay, surely fire is just extremely difficult for coal powder ignition.Present invention composition includes: main burner, the main burner is mounted on the quadrangle of boiler furnace, it is 40 °~43 ° that the water-cooling wall of the burner centre axis and burner hearth, which forms angle α range, the main burner includes one group of spaced apart overfire air jet and First air nozzle, the First air nozzle includes lower layer's First air nozzle, the light First air nozzle of the dense First air nozzle in upper layer and upper layer, and the overfire air jet includes A layers of overfire air jet, B layers of overfire air jet, C layers of overfire air jet.The present invention is burnt for coal dust depth concentration.
Description
Technical field:
The present invention relates to a kind of coal dust depth concentration combustion methods.
Background technique:
Thermoelectricity generating set pulverized-coal fired boiler will realize depth peak regulation, it is desirable that long-term safety stablizes fortune to boiler at low load
Row.Therefore the low-load combustion-stabilizing ability for improving coal powder fired boiler burner is imperative.
Boiler minimum steady fires ability, by coal quality fugitive constituent, moisture, ash, fineness of pulverized coal, pulverized coal fineness, burner
The influence of the factors such as type, air distribution.Under low loading conditions, since flame heat regulating is spread rapidly, flame temperature sharp-decay, coal
The steady fire of powder kindling is just extremely difficult.
Summary of the invention:
The object of the present invention is to provide a kind of coal dust depth concentration device and combustion method, burner is can be improved not in this method
The steady combustion ability of oil is thrown, boiler minimum steady is reduced and fires load.
Above-mentioned purpose is realized by following technical scheme:
A kind of coal dust depth concentration burner, composition includes: main burner, and the main burner is mounted on boiler
On the quadrangle of burner hearth, it is 40 °~43 ° that the water-cooling wall of the burner centre axis and burner hearth, which forms angle α range, described
Main burner includes one group of spaced apart overfire air jet and First air nozzle, and the First air nozzle includes that lower layer is primary
Wind nozzle, the light First air nozzle of the dense First air nozzle in upper layer and upper layer, the overfire air jet includes A layers of overfire air jet, B
Layer overfire air jet, C layers of overfire air jet.
A kind of coal dust depth concentration combustion method using coal dust depth concentration burner described in claim 1,
First air breeze airflow is divided into upper layer First air breeze airflow and lower layer's First air coal dust gas before entering burner hearth
Stream, upper layer First air breeze airflow are fuel-rich First air breeze airflow, and lower layer's First air breeze airflow is oxygen rich air First air
Coal powder density difference in breeze airflow, upper layer First air breeze airflow and lower layer's First air breeze airflow is up to 3-6 times；Lower layer
First air breeze airflow is injected directly into furnace by lower layer's First air nozzle, and upper layer First air breeze airflow is filled through horizontal bias
It sets and is divided into the light First air breeze airflow of the dense First air breeze airflow in upper layer and upper layer, respectively by the dense First air nozzle in upper layer and upper
The light First air nozzle of layer sprays into furnace, and the concentration difference in dense, light two strands of breeze airflows is equally up to 3-6 times；
For First air breeze airflow after two-stage is concentrated, the coal powder density in the dense First air breeze airflow in upper layer is lower layer one
9-36 times or more of coal powder density in secondary wind breeze airflow, ignition heat needed for coal dust significantly reduce, the ignition temperature of coal dust
It is greatly lowered；The dense First air breeze airflow directive burner hearth center in upper layer simultaneously, it is ensured that upstream high-temperature flue gas is in dense First air
The root of breeze airflow is sufficiently mixed with dense First air breeze airflow, is heated breeze airflow rapidly to the ignition temperature of coal dust, is made
It obtains breeze airflow promptly to catch fire in time, improves the stability of coal powder ignition, improve burner and do not throw oily steady combustion ability, reduce
Boiler minimum steady fires load；After the dense First air breeze airflow kindling in upper layer, the light First air breeze airflow in upper layer and Secondary Air air-flow
It is in time mixed into, supplemented with oxygen needed for coal dust full combustion, further improves the stability of coal dust firing；On meanwhile
The oxygen-enriched scarce combustion of the hypoxemia fuel-rich combustion and the light First air air-flow in upper layer, lower layer's First air breeze airflow of the dense First air air-flow of layer
Unit NO can be greatly lowered in material burningxDischarge amount.
The utility model has the advantages that
The present invention is in order to adapt to improve low-load combustion-stabilizing ability under the conditions of depth peak regulation, to pulverized coal preparation system, boiler combustion system
System is accordingly transformed, and improves burner stable and fires ability, reduces minimum steady and fires load.It effectively improves burner and does not throw oily steady combustion
Ability reduces boiler minimum steady and fires load.
Detailed description of the invention:
Attached drawing 1 is main burning area burner jet stream schematic diagram of the present invention.
Attached drawing 2 is main burner structural schematic diagram of the present invention.
Specific embodiment:
Embodiment 1:
A kind of coal dust depth concentration burner, composition includes: main burner, and the main burner is mounted on boiler
On the quadrangle of burner hearth, it is 40 °~43 ° that the water-cooling wall of the burner centre axis and burner hearth, which forms angle α range, described
Main burner includes one group of spaced apart overfire air jet and First air nozzle, and the First air nozzle includes that lower layer is primary
Wind nozzle, the light First air nozzle of the dense First air nozzle in upper layer and upper layer, the overfire air jet includes A layers of overfire air jet, B
Layer overfire air jet, C layers of overfire air jet.
Embodiment 2:
A kind of coal dust depth concentration combustion method using coal dust depth concentration burner described in claim 1, one
Secondary wind breeze airflow is divided into upper layer First air breeze airflow and lower layer's First air breeze airflow before entering burner hearth, and upper layer is primary
Wind breeze airflow is fuel-rich First air breeze airflow, and lower layer's First air breeze airflow is oxygen rich air First air breeze airflow, on
Coal powder density difference in layer First air breeze airflow and lower layer's First air breeze airflow is up to 3-6 times；Lower layer's First air coal dust
Air-flow is injected directly into furnace by lower layer's First air nozzle, and upper layer First air breeze airflow is divided into upper layer through horizontal bias device
The light First air breeze airflow of dense First air breeze airflow and upper layer passes through the dense First air nozzle in upper layer and the light First air in upper layer respectively
Nozzle sprays into furnace, and the concentration difference in dense, light two strands of breeze airflows is equally up to 3-6 times；
For First air breeze airflow after two-stage is concentrated, the coal powder density in the dense First air breeze airflow in upper layer is lower layer
9-36 times or more of coal powder density in (not being concentrated) First air breeze airflow, ignition heat needed for coal dust significantly reduce, coal dust
Ignition temperature be greatly lowered；The dense First air breeze airflow directive burner hearth center in upper layer simultaneously, it is ensured that upstream high-temperature flue gas
It is sufficiently mixed in the root of dense First air breeze airflow with dense First air breeze airflow, rapid heating breeze airflow to coal dust
Fiery temperature improves the stability of coal powder ignition so that breeze airflow promptly catches fire in time, improves burner and does not throw oily steady combustion
Ability reduces boiler minimum steady and fires load；After the dense First air breeze airflow kindling in upper layer, the light First air breeze airflow in upper layer and two
Secondary general mood stream is in time mixed into, and supplemented with oxygen needed for coal dust full combustion, further improves the stability of coal dust firing；
Meanwhile the hypoxemia fuel-rich combustion of the dense First air air-flow in upper layer and the light First air air-flow in upper layer, lower layer's First air breeze airflow
Unit NO can be greatly lowered in oxygen-enriched short bunker burningxDischarge amount.
As shown in Figure 1, flow rotation direction is counterclockwise.
Claims (1)
1. a kind of coal dust depth concentration burner, composition includes: main burner, it is characterized in that: the main burner is pacified
On the quadrangle of boiler furnace, it is 40 ° that the water-cooling wall of the main burner central axis and burner hearth, which forms angle α range,
~43 °, the main burner includes one group of spaced apart overfire air jet and First air nozzle, the First air nozzle
Including lower layer's First air nozzle, the light First air nozzle of the dense First air nozzle in upper layer and upper layer, the overfire air jet includes A layers
Overfire air jet, B layer overfire air jet, C layers of overfire air jet；
The coal dust depth concentration combustion method of the coal dust depth concentration burner, First air breeze airflow are entering burner hearth
Before be divided into upper layer First air breeze airflow and lower layer's First air breeze airflow, upper layer First air breeze airflow is that fuel-rich is primary
Wind breeze airflow, lower layer's First air breeze airflow are oxygen rich air First air breeze airflow, upper layer First air breeze airflow and lower layer
Coal powder density difference in First air breeze airflow is up to 3-6 times；Lower layer's First air breeze airflow passes through lower layer's First air nozzle
It is injected directly into furnace, and upper layer First air breeze airflow is divided into the dense First air breeze airflow in upper layer and upper layer through horizontal bias device
Light First air breeze airflow is sprayed into furnace by the light First air nozzle of the dense First air nozzle in upper layer and upper layer, dense, light two strands respectively
Concentration difference in breeze airflow is equally up to 3-6 times；
For First air breeze airflow after two-stage is concentrated, the coal powder density in the dense First air breeze airflow in upper layer is lower layer's First air
9-36 times or more of coal powder density in breeze airflow, ignition heat needed for coal dust significantly reduce, and the ignition temperature of coal dust is substantially
Degree reduces；The dense First air breeze airflow directive burner hearth center in upper layer simultaneously, it is ensured that upstream high-temperature flue gas is in dense First air coal dust
The root of air-flow is sufficiently mixed with dense First air breeze airflow, the ignition temperature of breeze airflow to coal dust is heated rapidly, so that coal
Powder air-flow promptly catches fire in time, improves the stability of coal powder ignition, improves burner and does not throw oily steady combustion ability, reduces boiler
Minimum steady fires load；After the dense First air breeze airflow kindling in upper layer, the light First air breeze airflow in upper layer and Secondary Air air-flow are in due course
Ground is mixed into, and supplemented with oxygen needed for coal dust full combustion, further improves the stability of coal dust firing；Meanwhile upper layer is dense
The hypoxemia fuel-rich combustion and the light First air air-flow in upper layer of First air air-flow, the oxygen-enriched short bunker of lower layer's First air breeze airflow fire
Unit NOx discharge can be greatly lowered in burning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851875.0A CN109028039B (en) | 2018-08-01 | 2018-08-01 | Coal dust depth concentration device and combustion method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851875.0A CN109028039B (en) | 2018-08-01 | 2018-08-01 | Coal dust depth concentration device and combustion method |
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| CN109028039A CN109028039A (en) | 2018-12-18 |
| CN109028039B true CN109028039B (en) | 2019-09-13 |
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| CN201810851875.0A Active CN109028039B (en) | 2018-08-01 | 2018-08-01 | Coal dust depth concentration device and combustion method |
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| CN111396867A (en) * | 2020-03-30 | 2020-07-10 | 哈尔滨锅炉厂有限责任公司 | Boiler pulverized coal combustion method with adjustable combustion tangent circle diameter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10274403A (en) * | 1997-03-31 | 1998-10-13 | Mitsubishi Heavy Ind Ltd | Pulverized fuel combustion burner |
| CN101995015A (en) * | 2009-08-14 | 2011-03-30 | 戴卫军 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
| CN203131804U (en) * | 2013-03-29 | 2013-08-14 | 广东电网公司电力科学研究院 | Pulverized coal boiler utilizing tangential firing |
| CN104033888A (en) * | 2014-06-11 | 2014-09-10 | 广东电网公司电力科学研究院 | Four-corner tangential boiler and hearth thereof |
| CN206386921U (en) * | 2017-01-09 | 2017-08-08 | 辽宁中电投电站燃烧工程技术研究中心有限公司 | A kind of quadrangle tangential circle burning device for coal-fired boiler for being applied to burning lignite at high proportion |
-
2018
- 2018-08-01 CN CN201810851875.0A patent/CN109028039B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10274403A (en) * | 1997-03-31 | 1998-10-13 | Mitsubishi Heavy Ind Ltd | Pulverized fuel combustion burner |
| CN101995015A (en) * | 2009-08-14 | 2011-03-30 | 戴卫军 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
| CN203131804U (en) * | 2013-03-29 | 2013-08-14 | 广东电网公司电力科学研究院 | Pulverized coal boiler utilizing tangential firing |
| CN104033888A (en) * | 2014-06-11 | 2014-09-10 | 广东电网公司电力科学研究院 | Four-corner tangential boiler and hearth thereof |
| CN206386921U (en) * | 2017-01-09 | 2017-08-08 | 辽宁中电投电站燃烧工程技术研究中心有限公司 | A kind of quadrangle tangential circle burning device for coal-fired boiler for being applied to burning lignite at high proportion |
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| CN109028039A (en) | 2018-12-18 |
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