CN111189044A - Burner with adjustable pulverized coal airflow speed for W-flame boiler and adjusting method thereof - Google Patents
Burner with adjustable pulverized coal airflow speed for W-flame boiler and adjusting method thereof Download PDFInfo
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- CN111189044A CN111189044A CN202010125944.7A CN202010125944A CN111189044A CN 111189044 A CN111189044 A CN 111189044A CN 202010125944 A CN202010125944 A CN 202010125944A CN 111189044 A CN111189044 A CN 111189044A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/007—Regulating fuel supply using mechanical means
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Abstract
The invention provides a burner with adjustable pulverized coal airflow speed of a W-flame boiler and an adjusting method thereof, which can realize the adjustment of the airflow speed of thick pulverized coal and the concentration of the pulverized coal and can be suitable for bituminous coal, lean coal and anthracite. The combustor comprises a two-stage coal powder shade separation device, a concentrated phase coal powder airflow eduction tube, a concentrated phase coal powder airflow nozzle, a light phase coal powder airflow eduction tube, a light phase coal powder airflow nozzle and an adjusting baffle; the two-stage coal powder concentration and dilution separation device comprises a cylindrical shell, a flow guide bluff body, a rotational flow impeller, a support rod, a concentrated phase coal powder airflow outlet and a diluted phase coal powder airflow outlet; the efficient shade separation of the pulverized coal airflow is realized through a flow guide bluff body and a rotational flow impeller in the two-stage pulverized coal shade separation device, wherein the dense-phase pulverized coal airflow is used as a main pulverized coal airflow for W flame boiler tissue combustion and is sprayed into a boiler tissue through a dense-phase pulverized coal airflow eduction tube and a dense-phase pulverized coal airflow nozzle for combustion; and the light-phase coal dust airflow is sprayed into the boiler through the light-phase coal dust airflow eduction tube and the light-phase coal dust airflow nozzle for combustion.
Description
Technical Field
The invention relates to an energy-saving emission-reducing reconstruction technology of a coal-fired thermal power generating unit, in particular to a burner with adjustable pulverized coal gas flow speed of a W-flame boiler and an adjusting method thereof.
Background
The W flame boiler is a main boiler type burning low-volatile coal such as inferior lean coal and anthracite, and has great advantages when burning low-volatile coal. However, with the continuous development of railway transportation and the opening of overseas coal markets, the power plants with W flame boilers in various regions can purchase bituminous coal with lower price. Therefore, the increasing coal market situation puts new demands on W-fired boilers, i.e. a large proportion of bituminous coal needs to be burned in order to control the fuel costs of the power plant.
However, the burner of the W-flame boiler is designed for low-volatile coal, and when bituminous coal is used, the combustion efficiency and the control of pollutants such as NOx are affected, and adverse effects such as burner nozzle burning loss occur, so that the W-flame boiler cannot meet the use requirements under new conditions.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a burner with adjustable pulverized coal airflow speed of a W-flame boiler and an adjusting method thereof, which realize the adjustment of the airflow speed of thick pulverized coal and the concentration of pulverized coal thereof, are suitable for burning bituminous coal with high volatile components and can burn lean coal and anthracite coal with low volatile components.
The invention is realized by the following technical scheme:
a burner with adjustable W flame boiler pulverized coal airflow speed comprises a two-stage pulverized coal concentration and dilution separation device, a concentrated phase pulverized coal airflow eduction tube, a concentrated phase pulverized coal airflow nozzle, a light phase pulverized coal airflow eduction tube, a light phase pulverized coal airflow nozzle and an adjusting baffle plate;
the two-stage coal powder concentration and dilution separation device comprises a cylindrical shell, a flow guide bluff body, a rotational flow impeller, a support rod, a concentrated phase coal powder airflow outlet and a diluted phase coal powder airflow outlet;
the upper end of the cylindrical shell is provided with a coal powder inlet, the upper part of the cylindrical shell is provided with an inlet reducer pipe with the diameter enlarged, and the lower end of the cylindrical shell is connected with a concentrated-phase coal powder airflow outlet arranged in a bent pipe; the light-phase coal dust airflow outlet passes through the bent pipe of the dense-phase coal dust airflow outlet and is arranged at the center of the lower part of the cylindrical shell; a supporting rod with an up-down adjustable position is arranged in the middle of the cylindrical shell; the top end of the supporting rod is provided with a flow guide bluff body, and the middle part of the supporting rod is provided with a rotational flow impeller; the flow guide bluff body is coaxially arranged on the inlet reducer pipe;
the dense-phase coal dust airflow outlet is sequentially connected with a dense-phase coal dust airflow eduction tube and a dense-phase coal dust airflow nozzle;
the light-phase coal powder airflow outlet is sequentially connected with a light-phase coal powder airflow outlet pipe and a light-phase coal powder airflow nozzle, and an adjusting baffle is arranged in the light-phase coal powder airflow outlet pipe.
Preferably, the flow guide blunt body is small at two ends and large in the middle and is arranged in a fluid manner.
Preferably, the swirl impeller comprises a sleeve in the middle and a guide vane welded at an angle or integrally cast on the sleeve; the sleeve is sleeved and fixed on the supporting rod.
Preferably, a hand hole is formed in the side wall of the middle of the cylindrical shell, external threads are formed in the lower portion of the supporting rod, a supporting rod connecting structure is arranged inside the light-phase pulverized coal airflow outlet, and internal threads are formed inside the connecting structure; the support rod is supported inside the light-phase coal powder airflow outlet through threaded connection.
Preferably, the dense-phase pulverized coal airflow nozzle is arranged on a furnace arch of the W flame boiler, and the light-phase pulverized coal airflow nozzle is arranged in a secondary air nozzle on the furnace arch of the W flame boiler and behind the dense-phase pulverized coal airflow nozzle.
Preferably, the cylindrical shell, the light-phase coal powder airflow outlet, the light-phase coal powder airflow eduction tube and the light-phase coal powder airflow nozzle which are arranged from top to bottom in sequence are coaxially arranged.
A method for adjusting a burner with adjustable pulverized coal gas flow velocity for a W-flame boiler is based on any one of the burners, and comprises the following steps,
step 2, performing secondary separation on the light-phase airflow in the central position through a cyclone impeller, and further separating coal powder particles in the light-phase airflow into a concentrated-phase coal powder airflow to increase the concentration separation efficiency of coal powder;
the light-phase coal powder airflow is distributed in the center of the lower part of the two-stage coal powder concentration and dilution separation device, enters the light-phase coal powder airflow eduction tube from the light-phase coal powder airflow outlet, and is sprayed into the hearth of the W flame boiler through the light-phase coal powder airflow nozzle to be combusted.
Preferably, the upper and lower positions of the flow guide blunt body at the reducing position of the two-stage coal powder concentration and dilution separation device are changed by adjusting the support rod, and meanwhile, the rotational flow impeller moves up and down along with the flow guide blunt body, so that the relative distance between the rotational flow impeller and the flow guide blunt body is ensured to be unchanged, and the coal powder concentration and dilution separation efficiency is adjusted; after the flow guide bluff body is adjusted upwards, the amount of the coal dust in the concentrated-phase coal dust airflow is increased, and otherwise, the amount of the coal dust is reduced.
Preferably, the flow distribution proportion of the concentrated-phase coal dust airflow and the light-phase coal dust airflow is adjusted by adjusting an adjusting baffle on the light-phase coal dust airflow outlet pipe;
when high-volatile coal is used, the baffle is closed or closed, the air speed of pulverized coal airflow at a dense-phase pulverized coal airflow nozzle is improved, the downward ejection of flame is strengthened, and the space utilization rate of a lower hearth is improved;
when the low-volatile coal is used, the large baffle is opened to reduce the airflow speed of the pulverized coal at the dense-phase pulverized coal airflow nozzle and strengthen the ignition of the pulverized coal.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention forms two streams of thick and thin coal dust airflows by the high-efficiency thick and thin separation device, realizes the adjustment of the airflow speed of the thick coal dust and the concentration of the coal dust, finally achieves the aim of giving consideration to the rigidity of ignition and downward ejection of the coal dust airflow, and is used for adapting to the requirements of different volatile coal. The efficient shade separation of the pulverized coal airflow is realized through a flow guide bluff body and a rotational flow impeller in a two-stage pulverized coal shade separation device, wherein the dense-phase pulverized coal airflow is used as a main pulverized coal airflow for W flame boiler tissue combustion and is sprayed into a boiler tissue through a dense-phase pulverized coal airflow eduction tube and a dense-phase pulverized coal airflow nozzle for combustion; and the light-phase coal dust airflow is sprayed into the boiler through the light-phase coal dust airflow eduction tube and the light-phase coal dust airflow nozzle for combustion. The burner adjusts the air flow speed of the thick pulverized coal and the concentration of the pulverized coal through the position of the adjusting support rod in the two-stage pulverized coal concentration and dilution separation device and the opening of the adjusting baffle on the dilute-phase pulverized coal air flow outlet pipe. The invention is easy to realize the adjustment of the main pulverized coal airflow speed and the pulverized coal concentration of the burner of the W flame boiler, is beneficial to the ignition of the pulverized coal airflow, ensures the downward ejection rigidity of the pulverized coal airflow and realizes the requirements of burning different volatile coals. The method is suitable for W flame boilers which have improvement requirements or are newly built and need to burn coal types with different volatile components.
Drawings
FIG. 1 is a schematic view of the structure of the combustor in the example of the present invention.
Fig. 2 is an enlarged view of the structure at I in fig. 1.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a schematic structural diagram of the swirl impeller according to the embodiment of the present invention.
In the figure: the two-stage pulverized coal concentration and dilution separation device comprises a two-stage pulverized coal concentration and dilution separation device 1, a flow guide bluff body 2, a rotational flow impeller 3, a support rod 4, a concentrated phase pulverized coal airflow outlet 5, a diluted phase pulverized coal airflow outlet 6, a concentrated phase pulverized coal airflow outlet pipe 7, a concentrated phase pulverized coal airflow nozzle 8, a diluted phase pulverized coal airflow outlet pipe 9, a diluted phase pulverized coal airflow nozzle 10, an adjusting baffle plate 11 and a hand hole 12.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a burner with adjustable coal powder airflow speed of a W-flame boiler, which comprises a two-stage coal powder concentration and dilution separation device 1, a concentrated-phase coal powder airflow eduction tube 7, a concentrated-phase coal powder airflow nozzle 8, a dilute-phase coal powder airflow eduction tube 9, a dilute-phase coal powder airflow nozzle 10 and an adjusting baffle plate 11, as shown in figure 1.
The two-stage coal powder concentration and dilution separation device 1 comprises a flow guide bluff body 2, a rotational flow impeller 3, a support rod 4 with an upper position and a lower position adjustable, a concentrated phase coal powder airflow outlet 5, a diluted phase coal powder airflow outlet 6 and a hand hole 12 on a cylindrical shell.
The coal dust airflow in the coal dust pipeline enters a combustor, and at the inlet reducing position of the two-stage coal dust concentration and dilution separation device 1, most coal dust particles are separated to the vicinity of the side wall of the two-stage coal dust concentration and dilution separation device 1 due to the fact that the diameter of a circulation pipeline is increased and the blocking of a guide blunt body 2 arranged in the center is achieved, so that concentrated-phase coal dust airflow is formed, and light-phase coal dust airflow is formed in the center of the two-stage coal dust concentration and dilution separation device 2; the middle light-phase coal powder gas is subjected to secondary concentration separation through the cyclone impeller 3, so that coal powder particles in the light-phase airflow are further separated into the concentrated-phase coal powder airflow, and the concentration separation efficiency of the coal powder is improved.
The dense-phase coal dust airflow is distributed near the side wall of the lower part of the two-stage coal dust concentration and dilution separation device 1, enters a dense-phase coal dust airflow eduction tube 7 from a dense-phase coal dust airflow outlet 5, and is sprayed into a W flame boiler hearth through a dense-phase coal dust airflow nozzle 8 for combustion; the light-phase coal powder airflow is distributed in the center of the lower part of the two-stage coal powder concentration and dilution separation device 1, enters the light-phase coal powder airflow outlet pipe 9 from the light-phase coal powder airflow outlet 6, and is sprayed into a W flame boiler hearth through the light-phase coal powder airflow nozzle 10 for combustion.
As shown in fig. 1, a hand hole 12 is formed on the cylindrical shell, as shown in fig. 2 and 3, the lower part of the support rod 4 is provided with an external thread, a support rod connecting structure is arranged inside the dilute phase coal dust airflow outlet 6, and an internal thread is arranged inside the connecting structure. The support rod 4 is supported inside the light-phase coal powder airflow outlet 6 after being connected through threads, and meanwhile, the relative connection position of the threads can be adjusted by rotating the support rod 4 through the hand hole 12, so that the upper position and the lower position of the support rod 4 can be adjusted.
As shown in fig. 4, the swirl vane wheel 3 is formed by welding or integrally casting guide vanes on a sleeve in the middle. The rotational flow impeller 3 penetrates the support rod 4 through the sleeve and then is welded and fixed.
The flow guide blunt body 2 is positioned at the reducing center of the upper part of the two-stage coal powder concentration and dilution separation device 1, and the upper and lower positions of the flow guide blunt body can be changed by adjusting the support rod 4, so that the aim of adjusting the coal powder concentration and dilution separation efficiency is fulfilled. Meanwhile, the proportion of the concentrated-phase coal dust airflow to the light-phase coal dust airflow can be adjusted by adjusting the adjusting baffle 10 on the light-phase coal dust airflow eduction tube 9. Finally, the adjustment of the air flow speed of the thick pulverized coal and the concentration of the pulverized coal is realized by adjusting the support rod 4 and the adjusting baffle 11 on the light-phase pulverized coal air flow outlet pipe 9.
By adopting the invention, the rigidity of firing and downward jetting of the pulverized coal airflow is ensured by adjusting the airflow speed of the concentrated pulverized coal of the burner and the concentration of the pulverized coal, and the requirements of burning different volatile coals of a W flame boiler are met.
In practice, the invention is applied to a plurality of W flame boilers, and has excellent effect, maturity and reliability; when the device is used, coal dust airflow entering a combustor firstly passes through the two-stage coal dust concentration and dilution separation device 1, the separation of the first stage is completed by the guide bluff body 2, so that most coal dust particles are separated to the vicinity of the side wall of the two-stage coal dust concentration and dilution separation device 1 to form concentrated-phase coal dust airflow, and therefore light-phase coal dust airflow can be formed at the center of the two-stage coal dust concentration and dilution separation device 1; the next second-stage separation is to perform secondary separation on the light-phase airflow at the central position through the cyclone impeller 3, so that the coal dust particles in the light-phase airflow are further separated into the dense-phase coal dust airflow, and the dense-dilute separation efficiency of the coal dust is improved. After the coal dust airflow is separated in two stages, the dense-phase coal dust airflow is distributed near the side wall of the lower part of the two-stage coal dust concentration and dilution separation device 1, enters a dense-phase coal dust airflow eduction tube 7 from a dense-phase coal dust airflow outlet 5 as the main coal dust airflow of the W flame boiler, and is sprayed into a hearth of the W flame boiler through a dense-phase coal dust airflow nozzle 8 to organize the combustion of the boiler; the light-phase coal powder airflow is distributed in the center of the lower part of the two-stage coal powder concentration and dilution separation device 1, enters the light-phase coal powder airflow outlet pipe 9 from the light-phase coal powder airflow outlet 6, and is sprayed into the hearth of the W flame boiler through the light-phase coal powder airflow nozzle 10 for combustion. The light-phase coal powder airflow is directly led out from the position right below the shade separation device, so that the burning loss of a combustor caused by the burning loss of a light-phase coal powder airflow leading-out pipe and a light-phase coal powder airflow nozzle due to the accumulation of coal powder caused by insufficient speed of the light-phase coal powder airflow is prevented. Specifically, the light-phase coal powder airflow nozzle 10 is arranged in a secondary air nozzle on a W flame boiler arch, and high-speed secondary air can carry the light-phase coal powder airflow, so that adverse conditions such as coking are prevented.
The flow guide blunt body 2 in the two-stage coal powder concentration separation device 1 is positioned at the reducing center of the two-stage coal powder concentration separation device 1, the upper and lower positions of the flow guide blunt body 2 at the reducing position of the two-stage coal powder concentration separation device 1 are changed by adjusting the supporting rod 4, and meanwhile, the swirl impeller 3 also moves up and down along with the flow guide blunt body 2, so that the relative distance between the swirl impeller and the flow guide blunt body 2 is ensured to be unchanged, and the purpose of adjusting the coal powder concentration separation efficiency is realized. After the flow guide blunt body 2 is adjusted upwards, the amount of the coal dust in the dense-phase airflow is increased, and otherwise, the amount of the coal dust is reduced.
The flow distribution proportion of the concentrated phase coal dust airflow and the light phase coal dust airflow can be adjusted by adjusting the adjusting baffle 11 on the light phase coal dust airflow eduction tube 9. The adjusting baffle 11 is turned down, so that the proportion of the concentrated-phase coal dust airflow can be increased, the flow speed of the concentrated-phase coal dust airflow is improved, and otherwise, the flow speed is reduced.
The burner rich pulverized coal airflow is the core airflow of the burner organized in the boiler for combustion. Finally, the burner can adjust the air flow speed of the thick pulverized coal and the pulverized coal concentration thereof by adjusting the support rod 4 and the adjusting baffle 11 on the light-phase pulverized coal air flow outlet pipe 9, so that the burner can adapt to the requirements of different volatile coals.
When the combustor burns high-volatile coal, the velocity of the dilute-phase coal powder airflow is low, so that the dilute-phase coal powder airflow nozzle 10 is arranged in a secondary air nozzle on a W flame boiler arch, and high-speed secondary air can carry the dilute-phase coal powder airflow, thereby preventing adverse conditions such as coking and the like.
The baffle plate on the light-phase pulverized coal airflow eduction tube 9 can be adjusted according to the coal types to be combusted, so that the airflow speed of the thick pulverized coal is realized, namely the airflow speed of the outlet of the main pulverized coal nozzle is adjustable, the down-shooting depth of the flame is adjusted, and the adaptability of various coal types is realized. When high-volatile coal is used, the baffle is closed or closed, the air speed of the pulverized coal airflow at the dense-phase pulverized coal airflow nozzle 8 is improved, the downward ejection of flame is strengthened, and the space utilization rate of a lower hearth is improved; when the low-volatile coal is used, the large baffle is opened, the air speed of the pulverized coal airflow at the dense-phase pulverized coal airflow nozzle 8 is reduced, and the ignition of the pulverized coal is strengthened.
The supporting rod 4 can be adjusted according to the type of coal to be fired, and the upper and lower positions of the flow guide bluff body 2 at the reducing position of the two-stage coal powder concentration and dilution separation device 1 are changed, so that the aim of adjusting the concentration and dilution separation efficiency of the coal powder is fulfilled. When the volatile component of the coal is reduced, the flow guide bluff body 2 is adjusted upwards, the concentration of the coal powder in the dense-phase airflow is increased, and the ignition of the coal powder can be strengthened.
Claims (9)
1. A burner with adjustable speed of W flame boiler pulverized coal airflow is characterized by comprising a two-stage pulverized coal concentration and dilution separation device (1), a concentrated phase pulverized coal airflow eduction tube (7), a concentrated phase pulverized coal airflow nozzle (8), a dilute phase pulverized coal airflow eduction tube (9), a dilute phase pulverized coal airflow nozzle (10) and an adjusting baffle plate (11);
the two-stage coal powder concentration and dilution separation device (1) comprises a cylindrical shell, a flow guide bluff body (2), a rotational flow impeller (3), a support rod (4), a concentrated phase coal powder airflow outlet (5) and a diluted phase coal powder airflow outlet (6);
the upper end of the cylindrical shell is a coal powder inlet, the upper part of the cylindrical shell is provided with an inlet reducer pipe with the diameter enlarged, and the lower end of the cylindrical shell is connected with a concentrated-phase coal powder airflow outlet (5) which is arranged in a bent pipe; the light-phase coal dust airflow outlet (6) penetrates through the bent pipe of the concentrated-phase coal dust airflow outlet (5) and is arranged at the center of the lower part of the cylindrical shell; a supporting rod (4) with an adjustable position is arranged in the middle of the cylindrical shell; the top end of the support rod (4) is provided with a flow guide bluff body (2), and the middle part is provided with a rotational flow impeller (3); the flow guide blunt body (2) is coaxially arranged on the inlet reducer pipe;
the concentrated-phase coal dust airflow outlet (5) is sequentially connected with a concentrated-phase coal dust airflow eduction tube (7) and a concentrated-phase coal dust airflow nozzle (8);
the light-phase coal powder airflow outlet (6) is sequentially connected with a light-phase coal powder airflow outlet pipe (9) and a light-phase coal powder airflow nozzle (10), and an adjusting baffle plate (11) is arranged in the light-phase coal powder airflow outlet pipe (9).
2. The burner of claim 1, wherein the flow guide bluff body (2) is fluid and has two small ends and a large middle.
3. The burner of claim 1, wherein the swirl vane wheel (3) comprises a sleeve in the middle and guide vanes welded at an angle or integrally cast on the sleeve; the sleeve is sleeved and fixed on the support rod (4).
4. The burner with the adjustable flow speed of the pulverized coal gas of the W-flame boiler as claimed in claim 1, wherein a hand hole (12) is arranged on the side wall of the middle part of the cylindrical shell, external threads are arranged on the lower part of the support rod (4), a support rod connecting structure is arranged inside the dilute phase pulverized coal gas flow outlet (6), and internal threads are arranged inside the connecting structure; the support rod (4) is supported inside the light-phase coal powder airflow outlet (6) through threaded connection.
5. The burner with adjustable velocity of pulverized coal airflow of W-flame boiler as claimed in claim 1, wherein the nozzle (8) for dense-phase pulverized coal airflow is installed on the arch of W-flame boiler, and the nozzle (10) for weak-phase pulverized coal airflow is installed in the secondary air nozzle on the arch of W-flame boiler, behind the nozzle (8) for dense-phase pulverized coal airflow.
6. The burner with the adjustable velocity of the pulverized coal airflow of the W-flame boiler as recited in claim 1, characterized in that the cylindrical shell, the light-phase pulverized coal airflow outlet (6), the light-phase pulverized coal airflow outlet pipe (9) and the light-phase pulverized coal airflow nozzle (10) which are arranged from top to bottom in sequence are coaxially arranged.
7. A method for adjusting a burner with adjustable pulverized coal gas flow velocity for a W-flame boiler, which is characterized in that the burner based on any one of claims 1-6 comprises the following steps,
step 1, coal dust airflow entering a combustor firstly passes through a two-stage coal dust concentration and dilution separation device (1), and a first-stage separation is completed by a flow guide blunt body (2), so that most coal dust particles are separated to the vicinity of the side wall of the two-stage coal dust concentration and dilution separation device (1) to form concentrated-phase coal dust airflow, and therefore light-phase coal dust airflow can be formed in the center position of the two-stage coal dust concentration and dilution separation device (1);
step 2, performing secondary separation on the light-phase airflow positioned at the central position through the cyclone impeller (3), and further separating coal dust particles in the light-phase airflow into a concentrated-phase coal dust airflow to increase the concentration separation efficiency of coal dust;
step 3, after the coal dust airflow is separated in two stages, the concentrated phase coal dust airflow is distributed near the side wall of the lower part of the two-stage coal dust concentration and dilution separation device (1), enters a concentrated phase coal dust airflow outlet pipe (7) from a concentrated phase coal dust airflow outlet (5) as the main coal dust airflow of the W flame boiler, and is sprayed into a hearth of the W flame boiler through a concentrated phase coal dust airflow nozzle (8) to organize the combustion of the boiler;
the light-phase coal dust airflow is distributed at the center of the lower part of the two-stage coal dust concentration and dilution separation device (1), enters a light-phase coal dust airflow outlet pipe (9) from a light-phase coal dust airflow outlet (6), and is sprayed into a hearth of a W flame boiler through a light-phase coal dust airflow nozzle (10) to be combusted.
8. The adjusting method of the burner with the adjustable flow velocity of the pulverized coal gas of the W-flame boiler as claimed in claim 7, characterized in that the up-down position of the guide bluff body (2) at the reducing position of the two-stage pulverized coal concentration and dilution separating device (1) is changed by adjusting the support rod (4), and simultaneously the swirl impeller (3) moves up and down along with the guide bluff body (2), so that the relative distance between the swirl impeller and the guide bluff body (2) is ensured to be unchanged, and the concentration and dilution separating efficiency of the pulverized coal is adjusted; after the flow guide blunt body (2) is adjusted upwards, the amount of the coal dust in the concentrated-phase coal dust airflow is increased, and otherwise, the amount of the coal dust is reduced.
9. The adjusting method of the burner with the adjustable flow velocity of the pulverized coal gas of the W-flame boiler as defined in claim 7 is characterized in that the flow distribution ratio of the dense-phase pulverized coal gas flow and the light-phase pulverized coal gas flow is adjusted by adjusting an adjusting baffle (11) on the light-phase pulverized coal gas flow outlet pipe (9);
when high-volatile coal is used, the baffle is closed or closed, the air speed of the pulverized coal airflow at the dense-phase pulverized coal airflow nozzle (8) is improved, the downward ejection of flame is strengthened, and the space utilization rate of a lower hearth is improved;
when the low-volatile coal is used, the large baffle is opened, the air speed of the pulverized coal airflow at the dense-phase pulverized coal airflow nozzle (8) is reduced, and the ignition of the pulverized coal is strengthened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125944.7A CN111189044A (en) | 2020-02-27 | 2020-02-27 | Burner with adjustable pulverized coal airflow speed for W-flame boiler and adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125944.7A CN111189044A (en) | 2020-02-27 | 2020-02-27 | Burner with adjustable pulverized coal airflow speed for W-flame boiler and adjusting method thereof |
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| CN111189044A true CN111189044A (en) | 2020-05-22 |
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|---|---|---|---|
| CN202010125944.7A Pending CN111189044A (en) | 2020-02-27 | 2020-02-27 | Burner with adjustable pulverized coal airflow speed for W-flame boiler and adjusting method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531520A (en) * | 2021-08-02 | 2021-10-22 | 国能南京电力试验研究有限公司 | W flame boiler suitable for difficult-to-burn coal and easy-to-burn coal and adjusting method thereof |
| CN113958948A (en) * | 2021-11-25 | 2022-01-21 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
-
2020
- 2020-02-27 CN CN202010125944.7A patent/CN111189044A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531520A (en) * | 2021-08-02 | 2021-10-22 | 国能南京电力试验研究有限公司 | W flame boiler suitable for difficult-to-burn coal and easy-to-burn coal and adjusting method thereof |
| CN113958948A (en) * | 2021-11-25 | 2022-01-21 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
| CN113958948B (en) * | 2021-11-25 | 2022-08-26 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
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