CN201306708Y - Quick ignition coal dust nozzle capable of automatically adjusting ignition point - Google Patents
Quick ignition coal dust nozzle capable of automatically adjusting ignition point Download PDFInfo
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- CN201306708Y CN201306708Y CNU2008201558852U CN200820155885U CN201306708Y CN 201306708 Y CN201306708 Y CN 201306708Y CN U2008201558852 U CNU2008201558852 U CN U2008201558852U CN 200820155885 U CN200820155885 U CN 200820155885U CN 201306708 Y CN201306708 Y CN 201306708Y
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- burning cavity
- stable burning
- coal
- ignition point
- coal dust
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Abstract
The utility model relates to a quick ignition coal dust nozzle capable of automatically adjusting an ignition point. The quick ignition coal dust nozzle comprises a stable combustion chamber, wherein, an outlet of the stable combustion chamber is connected with a hearth; and the lower part of the center line of an inlet of the stable combustion chamber is connected with a thick primary air/coal dust air stream inlet pipeline. The quick ignition coal dust nozzle is characterized in that a thermoelectric couple is arranged on the stable combustion chamber; a circumferential air opening is formed on at least one side of the stable combustion chamber; a valve is arranged on a circumferential air passage communicated with the circumferential air opening and used for controlling the circumferential air flow; and one end of an automatic actuating mechanism is connected with the valve, and the other end thereof is connected with the thermoelectric couple through a DCS system. The utility model has the advantages of effectively preventing the cooling wall of the hearth from hot erosion, slag bonding, and the like, and overcoming the shortcoming of the prior art.
Description
Technical field
The utility model relates to a kind of coal nozzle that catches fire fast that can regulate ignition point automatically, especially relates to a kind of coal nozzle that catches fire fast that can regulate ignition point automatically, belongs to the boiler coal-ash field of combustion technology.
Background technology
At present, along with the continuous increase of China's generated energy, the coal consumption amount of coal for power generation increases year by year, adopts the ratio of low-volatile coal also increasing in the coal for power generation.Low-volatile coal is because volatile content is low, ash is high, calorific value is low, how in boiler of power plant safety economy to use low-volatile coal be the constantly problem of research of China station boiler worker always, need to solve the problems such as the difficulty of catching fire, after-flame difficulty, the easy slagging scorification of burner hearth and high temperature corrosion of low-volatile coal.Simultaneously the consumption along with coal for power generation increases year by year, and the excursion of ature of coal is also increasing, and this just requires coal nozzle to have the ability of regulating ignition point, combustion instability and burn out nozzle when preventing that ature of coal from changing.
China's station boiler adopts coal powder light-dark to separate coal nozzle usually at present, is combined in coal nozzle and arranges that the technology of surrounding air satisfies the smooth combustion of above-mentioned low-volatile coal all around, enlarges requirements such as coal accommodation.As adopting the deep or light up and down separation coal nozzle of wide regulating ratio (WR), the horizontal bias of different deep or light separate modes separates coal nozzle etc.From operational effect, can control the ignition point of breeze airflow effectively by the aperture of regulating surrounding air, increase the rigidity of breeze airflow, prevent that breeze airflow is adherent and cause problems such as the high temperature corrosion of furnace wall cooling and slagging scorification.
Increasing the supply of ignition heat, is to guarantee that low-volatile coal dust air-flow is timely, the important means of stable ignition, needs to strengthen breeze airflow for this reason and mixes with the turbulent flow of high-temperature flue gas.The vortex precombustion chamber that China develops for many years, bluff body burner, binary channels general-purpose coal fines combustion device, flame stabilization ship burner, offset jet burner, preheating type coal burner etc. all mix to strengthen with the turbulent flow of high-temperature flue gas by the reinforcement breeze airflow and catch fire.
Name is called " flame stabilizing device of offset efflux " patent, application number is 88107152.8, this patent is by a wind coal dust spout of below-center offset, air and coal dust intermixture enter the stable burning cavity of round or rectangle with the speed of about 25m/s, under its ejector action, a very big recirculating zone appears in stable burning cavity top, thereby strengthens catching fire of breeze airflow.
Name is called " the binary channels general-purpose coal fines combustion device that ignition point position is adjustable " patent, the patent No. is ZL952208024, this utility model patent relates to the adjustable binary channels general-purpose coal fines combustion device of a kind of ignition point position, and this burner is made up of a upper and lower wind passage and the air channel, end and the side air channel that are located in the middle of upper and lower wind passage.Two strands of wind coal dusts enter the backflow space through upper and lower passage, form high temperature gases recirculating, and mix with a wind that enters, and make coal dust heat in advance, catch fire, burn, and side wind and end wind are used for regulating coal powder ignition point position.This utility model patent has the controlled advantage of coal powder ignition point.
Name be called " the preheating type coal burner that pre-temperature is adjustable ", the patent No. is ZL96211946.6, this utility model patent relates to the adjustable preheating type coal burner of a kind of pre-temperature, and this burner one end communicates with burner hearth, and the other end communicates with thick coal culm stream pipeline.In burner because air and coal dust intermixture enter round or square stable burning cavity with certain speed, under its ejector action, a bigger high temperature recirculation zone appears in stable burning cavity top, the high-temperature flue gas that refluxes carries out preheating to the thick coal culm air-flow, thereby has strengthened catching fire of breeze airflow.On the top that communicates the place with thick coal culm stream, have a capacity of returns and regulate the airduct road, one control valve is installed on the pipeline, situation in when operation according to burning, aperture to this valve is regulated, and just can control the air capacity that enters the recirculating zone, thereby regulates the circulating flow strength in the burner, satisfy not simultaneously the pre-heat effect that the degree that obtains is different in coal.But should adjusting work generally need the operations staff to carry out manual adjustments according to the situation of coal variation and burning, not too convenient when the user uses.
A kind of modified of this preheating type coal burner, on stable burning cavity, arrange thermocouple, adjuster is connected with the executing agency that capacity of returns is regulated on the airduct road, and the other end of adjuster is connected with thermocouple, controls ignition point automatically by the size of regulating capacity of returns adjusting wind.But this modified preheating type coal burner is not owing to establish surrounding air, and the coal dust back secondary wind that in time catches fire can not be sent at once, occurs the regional area anoxycausis easily and produces reducing atmosphere, and cause problem such as water wall high temperature corrosion.Owing to do not establish surrounding air, the rigidity of a wind/breeze airflow is relatively poor, and the adherent easily wall of sweeping causes problems such as the high temperature corrosion of furnace wall cooling and slagging scorification.In addition when coal when the direction of easily catching fire changes because surrounding air is not set, lack the means of further regulating ignition point, ignition point also appears easily too near the situation of nozzle.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of furnace wall cooling that can effectively prevent and produces the coal nozzle that catches fire fast that can regulate ignition point automatically of high temperature corrosion and slagging scorification.
For realizing above purpose, the technical solution of the utility model provides a kind of coal nozzle that catches fire fast that can regulate ignition point automatically, the outlet that comprises stable burning cavity, stable burning cavity links to each other with burner hearth, the center line bottom of stable burning cavity import is connected with a dense wind/breeze airflow inlet duct, it is characterized in that, be equipped with thermocouple on the stable burning cavity, stable burning cavity is provided with the circumference air port in a side at least, the surrounding air air channel that is communicated with the circumference air port is provided with the valve of control surrounding air air quantity, one end of automatic executing agency connects valve, and the other end is connected with thermocouple by the DCS system.
Technical problem to be solved in the utility model also can further be solved by following technical solution: be equipped with thermocouple on the stable burning cavity, stable burning cavity is provided with the circumference air port in a side at least, the surrounding air air channel that is communicated with the circumference air port is provided with the valve of control surrounding air air quantity, one end of automatic executing agency connects valve, the other end is connected with thermocouple by the DCS system, the center line top of stable burning cavity import is regulated the airduct road with capacity of returns and is connected, capacity of returns is regulated on the airduct road and is equipped with control valve, and automatic executing agency connects control valve.
The utility model is owing to adopt technique scheme, at least one side at preheating type thick coal culm burner is arranged surrounding air, catch fire back circumference wind energy enough than mixing with breeze airflow earlier at breeze airflow, prevent to produce local reducing atmosphere, reduced the burner region water-cooling wall and produced the risk of high temperature corrosion.The surrounding air air quantity can be regulated by automatic plate washer, on stable burning cavity, arrange the thermocouple of gaging nozzle temperature simultaneously, the case of fire that reflects nozzle by the temperature of thermocouple, the temperature of thermocouple is automatically adjusted by the surrounding air plate washer, thereby alleviate operations staff's workload, improve the unfailing performance of equipment.Surrounding air can also strengthen the rigidity of a wind/breeze airflow except that above-mentioned two functions, prevent that the adherent wall of sweeping of wind/breeze airflow from causing problems such as the high temperature corrosion of furnace wall cooling and slagging scorification.In a word,, design a kind of coal nozzle that catches fire fast that can regulate ignition point automatically, can prevent effectively that furnace wall cooling from producing problems such as high temperature corrosion and slagging scorification, overcomes the deficiency of prior art by existing preheating type coal burner is improved.
Description of drawings
Fig. 1 is the utility model embodiment 1 structural representation.
Fig. 2 is the utility model embodiment 2 structural representations.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment of the utility model the utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, be the utility model embodiment 1 structural representation, described a kind of coal nozzle that catches fire fast of regulating ignition point is made up of stable burning cavity 1, circumference air port 2, surrounding air air channel 3, valve 4, automatic executing agency 5 and thermocouple 9.
Enter stable burning cavity 1 from a dense wind/breeze airflow of a dense wind/breeze airflow inlet duct 7 with certain speed, under the ejector action of a wind/breeze airflow, a bigger high temperature gases recirculating district appears in stable burning cavity 1 top, the high-temperature flue gas that refluxes carries out preheating to a wind/breeze airflow, improved the outlet temperature of a wind/breeze airflow, so just reduced and reached wind/needed ignition heat of breeze airflow ignition temperature one time, thereby strengthened catching fire of breeze airflow, guaranteed that a wind/breeze airflow can catch fire fast.
Practical experience shows that the circumference air quantity can effectively be controlled the ignition point of a wind/breeze airflow.Open when big when the circumference air quantity, have more surrounding air to surround a wind/breeze airflow, because the temperature of surrounding air has only about 340 ℃, be far below the ignition temperature of low-volatile coal.The increase of circumference air quantity makes a wind/breeze airflow reach ignition temperature need absorb more heat, and ignition point will postpone to the burner hearth center position.The postponing and make the temperature be back to the hot flue gas in the stable burning cavity 1 descend to some extent of ignition point, the effect of a wind/breeze airflow of heating descends, temperature when one time wind/breeze airflow leaves stable burning cavity also can descend, make a wind/breeze airflow reach ignition temperature equally and need absorb more heat, ignition point also can postpone to the burner hearth center position.When the circumference air quantity turned down, effect was just in time opposite, and ignition point can be near jet expansion.In " DL/T852-2004 boiler startup debugging guide rule ", the control ignition point leaves the jet hole position between 0.3～0.5m when requiring burning to adjust.
The change in location of ignition point can have influence on the stable burning cavity 1 variation of temperature of the thermocouple of arranging 9, crosses when far away when ignition point leaves nozzle, and the temperature of thermocouple 9 can descend, otherwise, when leaving nozzle, crosses when near at ignition point, and the temperature of thermocouple 9 can raise.Under the extreme operating condition, when wind/breeze airflow during in stable burning cavity 1 internal combustion, the temperature of thermocouple 9 can sharply raise, and this need be avoided, otherwise can cause in the stable burning cavity 1 serious slagging scorification and burn out burner.Pass through control system, according to thermocouple 9 variation of temperature, just can come the aperture of by-pass valve control 4 by automatic executing agency 5, automatically the Position Control of ignition point is being left about jet hole 0.3～0.5m, guarantee that a wind/breeze airflow can catch fire fast on the one hand, the situation that can prevent on the one hand serious slagging scorification in the stable burning cavity in addition and burn out burner takes place, and can prevent furnace wall cooling slagging scorification and high temperature corrosion simultaneously.
During boiler operatiopn, the principal element that influences a wind/breeze airflow ignition point has coal to change boiler load variation etc.Under the coal excursion is not very big situation, and boiler load can be realized the automatic control of ignition point when changing by the adjusting of circumference air quantity.
Embodiment 2:
As shown in Figure 2, be the utility model embodiment 2 structural representations, described a kind of coal nozzle that catches fire fast of regulating ignition point is regulated airduct road 11 by stable burning cavity 1, circumference air port 2, surrounding air air channel 3, valve 4, automatic executing agency 5, control valve 10, thermocouple 9 and capacity of returns and is formed.
Under the very big situation of coal excursion, the fugitive constituent that normally moves coal is far above design coal, when its flammability will be much better than design coal, ignition point may take place leave the near excessively situation of nozzle, at this moment the temperature of thermocouple 9 can be sent warning as the supervisory signal of safe operation of the boiler to the operations staff far above normal value.The operations staff just can manual adjustments be installed in the control valve 10 that capacity of returns is regulated airduct road 11, drive big this control valve 10, allow the part air flow into stable burning cavity 1, reduce the circulating flow strength in the stable burning cavity 1, cooperate the adjusting of circumference air quantity, the control ignition point is in normal scope, to guarantee the safe and reliable operation of equipment.
The structural dimensions of the coal nozzle that catches fire fast of regulating ignition point of the present utility model is as follows:
The ratio of stable burning cavity 1 length L and stable burning cavity 1 diameter D is: L/D=0.8～2.5, the ratio of stable burning cavity 1 diameter D and a dense wind/breeze airflow inlet duct 7 diameter Dc is: D/Dc=1.5～3.0, the diameter Da in capacity of returns adjusting airduct road 11 and the ratio of a dense wind/breeze airflow inlet duct 7 diameter Dc are in the stable burning cavity 1: Da/Dc=0.3～0.6, the width in circumference air port 2 is for being not more than 200mm.
When stable burning cavity 1 was square, D was equivalent to the height of stable burning cavity.
An embodiment of the present utility model is:
L/D=1.5, D/Dc=2.1, Da/Dc=0.43, the width H of surrounding air is 40～90mm.
Claims (2)
1, a kind of coal nozzle that catches fire fast that can regulate ignition point automatically, comprise stable burning cavity (1), the outlet of stable burning cavity (1) links to each other with burner hearth (6), the center line bottom of stable burning cavity (1) import is connected with a dense wind/breeze airflow inlet duct (7), it is characterized in that, be equipped with thermocouple (9) on the stable burning cavity (1), stable burning cavity is provided with circumference air port (2) in a side at least, the surrounding air air channel (3) that is communicated with circumference air port (2) is provided with the valve (4) of control surrounding air air quantity, one end of automatic executing agency (5) connects valve (4), and the other end is connected with thermocouple (9) by DCS system (8).
2, a kind of coal nozzle that catches fire fast that can regulate ignition point automatically according to claim 1, it is characterized in that, the center line top of stable burning cavity (1) import is regulated airduct road (11) with capacity of returns and is connected, capacity of returns is regulated on the airduct road (11) and is equipped with control valve (10), and automatic executing agency (12) connects control valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201558852U CN201306708Y (en) | 2008-11-25 | 2008-11-25 | Quick ignition coal dust nozzle capable of automatically adjusting ignition point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201558852U CN201306708Y (en) | 2008-11-25 | 2008-11-25 | Quick ignition coal dust nozzle capable of automatically adjusting ignition point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201306708Y true CN201306708Y (en) | 2009-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201558852U Expired - Lifetime CN201306708Y (en) | 2008-11-25 | 2008-11-25 | Quick ignition coal dust nozzle capable of automatically adjusting ignition point |
Country Status (1)
| Country | Link |
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| CN (1) | CN201306708Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288632A (en) * | 2010-10-15 | 2011-12-21 | 北京宏孚瑞达科技有限公司 | Method for measuring ignition point of wind powder mixture in coal burning boiler |
| CN103047676A (en) * | 2012-12-28 | 2013-04-17 | 刘建松 | Extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method on basis of single nozzle for hearth |
| WO2023160032A1 (en) * | 2022-02-25 | 2023-08-31 | 西安热工研究院有限公司 | Direct-current burner primary air chamber and method for preventing boiler slagging and high-temperature corrosion |
-
2008
- 2008-11-25 CN CNU2008201558852U patent/CN201306708Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288632A (en) * | 2010-10-15 | 2011-12-21 | 北京宏孚瑞达科技有限公司 | Method for measuring ignition point of wind powder mixture in coal burning boiler |
| CN102288632B (en) * | 2010-10-15 | 2013-04-17 | 北京宏孚瑞达科技有限公司 | Method for measuring ignition point of wind powder mixture in coal burning boiler |
| CN103047676A (en) * | 2012-12-28 | 2013-04-17 | 刘建松 | Extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method on basis of single nozzle for hearth |
| CN103047676B (en) * | 2012-12-28 | 2015-10-07 | 刘建松 | Based on single nozzles burner hearth fire extinguishing, explosion-proof, surely fire autocontrol method |
| WO2023160032A1 (en) * | 2022-02-25 | 2023-08-31 | 西安热工研究院有限公司 | Direct-current burner primary air chamber and method for preventing boiler slagging and high-temperature corrosion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |