CN210463091U - Pulverized coal tiny-oil ignition device - Google Patents
Pulverized coal tiny-oil ignition device Download PDFInfo
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- CN210463091U CN210463091U CN201921203860.XU CN201921203860U CN210463091U CN 210463091 U CN210463091 U CN 210463091U CN 201921203860 U CN201921203860 U CN 201921203860U CN 210463091 U CN210463091 U CN 210463091U
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- oil
- pulverized coal
- combustion
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- gun
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- 239000003245 coal Substances 0.000 title claims abstract description 75
- 230000007704 transition Effects 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 8
- 239000000446 fuel Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 2
- 241001330002 Bambuseae Species 0.000 abstract 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 2
- 239000011425 bamboo Substances 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 83
- 239000000843 powder Substances 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Abstract
The utility model relates to a tiny-oil ignition device, especially a buggy tiny-oil ignition device who extensively uses in power plant pulverized coal boiler ignition start-up process, including tiny-oil point firearm and pulverized coal burner, tiny-oil point firearm including main little oil gun of heat, combustion-supporting dryer, burning torch, flame detector, surely fire cover etc. pulverized coal burner include pulverized coal burner body and with tiny-oil point firearm hookup transition flange for, in order to prevent burning out a burning section of thick bamboo and improve heat exchange efficiency, with little oil gun and pipe, burning torch and pipe, surely fire cover etc. and do not extend and shift, in the pulverized coal burner is directly sent into to the oil gun flame, the direct heating is fire coal, flame power obtains abundant release, has protected a burning section of thick bamboo completely and has improved heating efficiency, further economizes on fuel and practices thrift.
Description
Technical Field
The invention relates to a boiler combustion device, in particular to a pulverized coal and tiny-oil ignition device which is widely used in the tiny-oil ignition starting process in the field of coal-fired and tiny-oil power station boiler combustion.
Background
For a long time, in the starting process of a coal-powder power station boiler, a tiny-oil igniter called a small oil gun is continuously used, which takes a small-flow oil gun (rated flow is about 60kg/h) as a core, the small oil gun is arranged in a small combustion cylinder, a flame outlet of the small oil gun is positioned at about the middle section of the combustion cylinder, the cylinder is externally connected with combustion-supporting air, the air is divided into an inner layer and an outer layer of annular air after entering the combustion cylinder, after the small oil gun is ignited, high-temperature flue gas is formed and sprayed under the combustion supporting and cooling of the two layers of combustion-supporting air, the flue gas directly heats primary air-powder airflow of the boiler in the coal-powder burner, volatile components in coal powder are firstly ignited, then fixed carbon is heated or ignited, the ignited primary air-powder directly enters a hearth for combustion, the boiler is heated and warmed, and reaches the complete coal feeding condition, the whole process is a process of boiler temperature rise by replacing oil with coal, the temperature of the boiler is raised by means of the heat of the coal due to the high price of the fuel oil and the relatively low price of the coal, so that the boiler temperature is greatly reduced, but the temperature of the ignition flue gas output by a micro-oil igniter is low, a large amount of unburned carbon particles exist in the flue gas in the hearth, the boiler temperature rise is indirectly slow, more fuel is put in, the coal is seriously wasted, and a certain potential safety hazard also exists.
However, careful observation of the large number of tiny-oil ignitors in use has two most prominent drawbacks:
1. the micro-oil igniter body is in a high-temperature roasting state of fuel flame per se for a long time, the working condition is severe, the micro-oil igniter body is easy to damage, and the reliability and the service life are seriously influenced;
2. the flame radiation field is limited, the power cannot be fully exerted, the temperature field of the output flue gas is low, the output flue gas is unfavorable for the ignition coal powder, and a large amount of unburned fixed carbon exists in the tail gas;
3. the ignition time of pulverized coal is delayed by the output low-temperature flue gas, the temperature rise curve of the boiler is too gentle, the temperature rise time is prolonged, and a large amount of coal is wasted;
4. the fuel flame is difficult to establish reliably, due to the fact that the technologies of suppliers on the market are different, the level and the experience are seriously short, the combustion technology is not deeply understood, ignition and stable combustion are two completely different concepts, whether ignition is possible depends on an ignition device, and whether stable combustion is possible depends on a combustion mode. The small oil guns adopt a gasification technology, but the flame propagation mechanism is not clear, so that repeated ignition and repeated purging are caused, the effect of saving oil is not achieved, a large amount of fuel oil and coal are wasted, and the grid connection of a unit is delayed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pulverized coal micro-oil ignition device aiming at the current state of the prior art.
The technical scheme adopted by the invention for solving the technical problems is that the pulverized coal tiny-oil ignition device comprises a tiny-oil igniter and a pulverized coal burner; the micro-oil igniter comprises a combustion-supporting air duct, a small oil gun and a guide pipe, an ignition gun and a guide pipe, a fire detection and guide pipe, a stable combustion cover and a flange for installation and fixation; the pulverized coal burner comprises a pulverized coal burner body, a square round joint, a transition flange and the like; the micro-oil igniter is connected with a right angle of the pulverized coal burner through a transition flange, and the central lines of the micro-oil igniter and the pulverized coal burner are intersected in a mode of being vertical or being smaller than 90 degrees.
Drawings
Fig. 1 is a front view of the overall structure of an oil gun in a front combustion mode, and fig. 2 is a top sectional view a of a pulverized coal micro-oil ignition device of fig. 1.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings:
the structure of the invention is as follows:
referring to the attached drawings 1 and 2, a pulverized coal tiny-oil ignition device comprises: the micro-oil igniter comprises a combustion-supporting air duct 2, a combustion-supporting air inlet 3, a positioning flange 4, a butt flange 5, a combustion-stabilizing cover 6, a small oil gun and guide pipe 7, an ignition gun and guide pipe 8 and a fire detection and guide pipe 9; the pulverized coal burner comprises a pulverized coal burner body 1, a transition flange 10 and a square round joint 11.
The combustion-supporting air duct 2 of the micro-oil igniter of the pulverized coal micro-oil ignition device is internally and coaxially provided with a combustion stabilizing cover 6, a small oil gun and guide pipe 7, an ignition gun and guide pipe 8 and a fire detection and guide pipe 9; a stable combustion cover 6 is arranged at the outlet end parts of the small oil gun and the guide pipe, and the small oil gun, the guide pipe and the stable combustion cover are fixed to the cold end of the combustion-supporting air duct 2 through a positioning flange 4; combustion-supporting air enters the combustion-supporting air duct 2 from the combustion-supporting air inlet 3;
a reserved hole is formed in a right angle of a pulverized coal burner body 1 of the pulverized coal micro-oil ignition device, a transition flange 10 is welded on the reserved hole, a butting flange 5 is connected to the transition flange 10, and a micro-oil igniter is installed at an inlet of the transition flange 10 through the butting flange 5;
the butt flange 5 is welded at the outlet position of the combustion-supporting air duct 2;
wherein the ignition gun and the conduit 8 comprise an ignition gun and an ignition gun conduit;
wherein the small oil gun and guide pipe 7 comprises a small oil gun and a small oil gun guide pipe;
wherein, the stable combustion cover 6 of the pulverized coal tiny-oil ignition device is welded on the small oil gun and the head part of the guide pipe in the guide pipe 7;
the pulverized coal burner of the pulverized coal micro-oil ignition device is characterized in that pulverized coal is blown by primary air, enters the pulverized coal burner body 1 from the square round joint 11, and penetrates through the pulverized coal burner body to enter a hearth;
in the present embodiment, the micro-oil igniter is vertically installed on one of the right angles of the pulverized coal burner body 1, that is, the center line of the micro-oil igniter perpendicularly intersects the center line of the pulverized coal burner.
In this embodiment, the head of the small oil gun in the small oil gun and conduit 7 and the right-angled inner wall of the pulverized coal burner body 1 are kept at a proper distance, and a proper fuel atomization angle is adopted, so that the flame jet ejected by the small oil gun better avoids the inner wall of the pulverized coal burner body 1, the fuel coking is effectively prevented, and the pulverized coal airflow is prevented from eroding the head of the small oil gun.
The working principle is as follows:
in this embodiment, firstly, the boiler starts combustion-supporting air, the combustion-supporting air enters the combustion-supporting air duct 2 through the combustion-supporting air inlet 3, and the air becomes two layers of air: one layer of internal air, namely central air, enters the stable combustion cover 6 and becomes rotational flow air after exiting the stable combustion cover 6 to form a negative pressure backflow area so as to be beneficial to the establishment of oil gun flame, and the other part of peripheral air, namely outer layer air, is directly sent to the periphery of the small oil gun flame area through an annular gap between the stable combustion cover 6 and the combustion-supporting air duct 2 and also reaches the inside of the pulverized coal burner body 1;
when ignition is carried out, the ignition gun in the ignition gun and guide pipe 8 reaches the ignition position shown in the attached drawing 2, then ignition is started, and the small oil gun in the guide pipe 7 start to inject oil and are rapidly ignited by the ignition gun to form fuel flame.
The fuel flame sprayed by the small oil gun is injected into the pulverized coal burner body 1 at a certain angle, and when primary air powder passes through the pulverized coal burner body 1, the primary air powder encounters the high-temperature flame sprayed by the small oil gun, so that the primary air powder airflow is quickly ignited under the high-temperature heating action of the flame of the small oil gun.
The benefits of this are:
the pulverized coal tiny-oil ignition device is characterized in that the heads of a small oil gun and a guide pipe 7, an ignition gun and a guide pipe 8, and a stable combustion cover 6 are simultaneously shifted towards the direction close to a pulverized coal burner body 1, and a flame of the small oil gun is sprayed out of a combustion-supporting air duct 2 to reach the pulverized coal burner, so that the high-temperature oil flame is rapidly cooled, and meanwhile, primary air powder after heat absorption is heated and rapidly reaches a spontaneous combustion condition to burn, and the small oil gun and the guide pipe are mutually complemented:
1) the pulverized coal tiny-oil ignition device can enable primary air powder to be easily burnt out, the flame of a small oil gun directly enters the pulverized coal burner body 1, and fixed carbon in the primary air pulverized coal which is in contact with the oil flame can be directly ignited due to the fact that the temperature of the oil flame can reach about 2000 ℃ (such as a supersonic oil gun), secondary combustion of a tail flue (an economizer, an air preheater and the like) is effectively prevented, and safety of the system is improved; in the prior external micro-oil igniter, oil flame is cooled deliberately, high-temperature smoke is adopted to heat coal powder instead of flame, the smoke temperature is reduced sharply, the heating power of the flame is weakened directly, and the combustion of carbon in the air powder needs to be maintained at a high temperature of more than 1000 ℃, so a large amount of unburned fixed carbon enters a hearth, only volatile components in the coal are combusted, fuel is wasted seriously, and the adverse condition of secondary combustion of an air preheater in a tail flue occurs.
2) Compared with the design on the market at present, the pulverized coal micro-oil ignition device saves more oil, because the fixed carbon in the coal participates in combustion, a large amount of heat is released, the amount of the coal ignited into the boiler can be correspondingly reduced, and the ignition device is in turn more favorable for the full combustion of the coal and saves more energy.
3) The pulverized coal tiny-oil ignition device prolongs the service life of the tiny-oil igniter, reduces the loss and improves the operation reliability of the device because the flame area of the small oil gun is not positioned in the combustion-supporting air duct 2.
4) The coal powder micro-oil ignition device is characterized in that parts such as a small oil gun, a fire detector and an ignition gun are easier to replace, and the maintenance is simple and convenient: after the positioning flange 4 is detached, the stable combustion cover 6, the small oil gun and guide pipe 7, the ignition gun and guide pipe 8 and the fire detection and guide pipe 9 can be pulled out together; the small oil gun in the small oil gun and guide pipe 7, the ignition gun in the ignition gun and guide pipe 8 and the fire detection probe in the fire detection and guide pipe 9 can also be pulled out independently for independent maintenance and operation.
5) The pulverized coal tiny-oil ignition device has the advantages that the combustion-supporting air duct 2 is in a low-temperature state all the year round, the high-temperature resistance requirement on the material of the ignition-supporting air duct is lowered, and meanwhile, the ignition-supporting air duct does not need to be heavily cut off to connect with a steel plate between the ignition-supporting air duct and the outer wall of a boiler to check and replace.
6) The coal powder micro-oil ignition device can be used for better protecting the small oil gun by independently arranging the advancing and retreating mechanism besides the advancing and retreating mechanism required to be laid by the ignition gun.
7) The pulverized coal tiny-oil ignition device adopts the spiral-flow type stable combustion cover 6 to distribute air for the small oil gun, and simultaneously adopts the supersonic oil-saving environment-friendly oil gun of the patented technology to be matched for use, so that premixed combustion is realized, flame is easy to establish, and the combustion is stable.
Claims (5)
1. A pulverized coal tiny-oil ignition device comprises a tiny-oil igniter and a pulverized coal burner, and is characterized in that the tiny-oil igniter comprises a combustion-supporting air duct (2), a combustion-supporting air inlet (3), a positioning flange (4), a butt flange (5), a combustion-stabilizing cover (6), a small oil gun and a guide pipe (7), an ignition gun and a guide pipe (8) and a fire detection and guide pipe (9); the pulverized coal burner comprises a pulverized coal burner body (1), a transition flange (10) and a square round joint (11).
2. The pulverized coal tiny-oil ignition device according to claim 1, characterized in that a stable combustion cover (6), a small oil gun and a guide pipe (7), an ignition gun and a guide pipe (8) and a fire detection and guide pipe (9) are coaxially arranged in a combustion-supporting air duct (2), the stable combustion cover (6) is arranged at the end part of the guide pipe outlet of the small oil gun and the guide pipe (7), and is fixed to the cold end of the combustion-supporting air duct (2) through a positioning flange (4), and combustion-supporting air enters the combustion-supporting air duct (2) through a combustion-supporting air inlet (3).
3. The pulverized coal micro-oil ignition device as claimed in claim 1, wherein the micro-oil igniter is connected to the transition flange (10) through the butt flange (5), and the transition flange (10) is directly and vertically welded to an angular hole of the pulverized coal burner body (1).
4. The pulverized coal tiny-oil ignition device according to claim 1, characterized in that the head of the small oil gun in the small oil gun and the conduit (7) extends out of the combustion-supporting air duct (2) and is intersected with an edge of the pulverized coal burner body (1) in a virtual way.
5. The pulverized coal tiny-oil ignition device according to claim 1, characterized in that the tiny-oil igniter is connected with the transition flange (10) through the butt flange (5) and then positioned on the pulverized coal burner body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921203860.XU CN210463091U (en) | 2019-07-29 | 2019-07-29 | Pulverized coal tiny-oil ignition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921203860.XU CN210463091U (en) | 2019-07-29 | 2019-07-29 | Pulverized coal tiny-oil ignition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210463091U true CN210463091U (en) | 2020-05-05 |
Family
ID=70448180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921203860.XU Expired - Fee Related CN210463091U (en) | 2019-07-29 | 2019-07-29 | Pulverized coal tiny-oil ignition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210463091U (en) |
-
2019
- 2019-07-29 CN CN201921203860.XU patent/CN210463091U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200505 |
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| CF01 | Termination of patent right due to non-payment of annual fee |