CN213066086U - Solid-gas-liquid three-phase combined combustion burner - Google Patents
Solid-gas-liquid three-phase combined combustion burner Download PDFInfo
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- CN213066086U CN213066086U CN202021431407.7U CN202021431407U CN213066086U CN 213066086 U CN213066086 U CN 213066086U CN 202021431407 U CN202021431407 U CN 202021431407U CN 213066086 U CN213066086 U CN 213066086U
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Abstract
The utility model provides a solid-gas-liquid three-phase combined combustion burner, relating to a boiler burner; the problem of boiler fuel limitation is solved; the pulverized coal burner comprises a pulverized coal burner, wherein a fuel system and a gas system are arranged in the pulverized coal burner, the fuel system comprises a fuel inlet, a fuel channel and a fuel nozzle which are arranged at the front end of the pulverized coal burner, one end of the fuel channel is connected with the fuel inlet, and the other end of the fuel channel is connected with the fuel nozzle; the gas system comprises a gas inlet, a gas annular header, a gas channel and a gas nozzle, wherein the gas inlet is connected with the outer wall of the pulverized coal burner; the device has good combustion stability and can realize various combustion modes of solid gas, solid liquid and solid gas liquid.
Description
Technical Field
The utility model relates to a boiler burner, in particular to a solid gas liquid three-phase combined combustion burner.
Background
With the development of the combustion technology of the industrial boiler, the change of an energy supply structure and the stricter requirements on energy conservation and environmental protection, the high-efficiency, energy-saving and low-pollution industrial boiler product adopting clean fuel and clean combustion technology is rapidly developed. In recent years, a large number of high-efficiency pulverized coal industrial boilers, gas industrial boilers and oil industrial boilers are built, and the industrial boilers are required to be equipped with burners with excellent performance for ensuring full combustion of fuel and reducing pollutant emission. Burners are an important component of boiler systems.
Due to factors such as climate, geographic environment and energy supply relationship, the industrial boiler is often affected by insufficient storage or insufficient supply of certain fuel in the operation process, for example, pulverized coal or fuel oil cannot be supplied in severe weather, and 'gas shortage' occurs due to large gas demand in a certain period of time, so that the boiler is stopped or the load is reduced to cause civil problems or production accidents. Because the fuel used by the combustor arranged in the industrial boiler at present is basically single, and the pulverized coal, the fuel gas and the fuel oil are used independently, no better solution is provided when similar problems or accidents occur. Based on this, in order to avoid the civil problem or production accident caused by the shutdown of the boiler or the reduction of the load operation when the fuel is insufficient or lack of supply, it is necessary to develop a solid-gas-liquid three-phase combined combustion burner, the pulverized coal, the gas and the fuel oil can be simultaneously combusted in three phases or combusted in any two phases or combusted in only one phase, the combustion combination mode can be rapidly adjusted according to the reserve condition of energy, and the coal, the gas and the oil are suitable for the coal. Has practical urgency.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a solid gas liquid three combustor that makes up burning together. The problem of boiler fuel limitation is solved.
In order to achieve the above purpose, the present invention is achieved by the following technical solutions.
A solid-gas-liquid three-phase combined combustion burner comprises a pulverized coal burner, wherein a fuel system and a gas system are arranged in the pulverized coal burner, the fuel system comprises a fuel inlet, a fuel channel and a fuel nozzle which are arranged at the front end of the pulverized coal burner, one end of the fuel channel is connected with the fuel inlet, and the other end of the fuel channel is connected with the fuel nozzle; the gas system comprises a gas inlet, a gas annular header, a gas channel and a gas nozzle, wherein the gas inlet is connected with the outer wall of the pulverized coal burner, the gas inlet is connected with the gas annular header, and the gas annular header is connected with the gas nozzle through the gas channel.
Furthermore, a central air system, a primary air system, an inner secondary air system and an outer secondary air system are arranged in the pulverized coal burner, the central air system comprises a central air chamber, a central air annular channel connected with the central air chamber and a central cyclone device connected with the central air annular channel, and an air outlet of the central cyclone device is connected with a boiler hearth.
The primary air system comprises a primary air inlet and a primary air powder chamber connected with the primary air inlet, and the primary air powder chamber is connected with the pulverized coal nozzle through a primary air powder annular channel.
The inner secondary air system comprises an inner secondary air inlet and an inner secondary air chamber connected with the inner secondary air inlet, the inner secondary air chamber is connected with an inner secondary air cyclone through an inner secondary air annular channel, and an air outlet of the inner secondary air cyclone is connected with a boiler hearth.
The outer secondary air system comprises an outer secondary air inlet and an outer secondary air chamber connected with the outer secondary air inlet, the outer secondary air chamber is connected with an outer secondary air cyclone through an outer secondary air annular channel, and an air outlet of the outer secondary air cyclone is connected with a boiler hearth.
Further, the fuel oil channel is arranged in the central air chamber and is positioned in the central position of the pulverized coal burner.
Further, the gas inlet is arranged on the side wall of the pulverized coal burner.
Further, an inner secondary air adjusting plate is arranged at the inner secondary air inlet; and an outer secondary air adjusting plate is arranged at the outer secondary air inlet.
The utility model discloses produced beneficial effect does for prior art.
1. The combustion stability is good: under the condition of burning coal dust, the burner can be accompanied with the combustion of fuel gas and/or fuel oil at the initial stage, and the surrounding of the coal dust is favorable for forming a high-temperature environment and the stability of the flame of the coal dust. And the combustion stability of the fuel gas and the fuel oil is better.
2、NOXThe production amount is low: the combustion mode of the burner is a typical air staged combustion mode, the air channel is divided into a central air annular channel, a primary air powder annular channel, an inner secondary air annular channel and an outer secondary air annular channel, when the burner is arranged in a boiler hearth, an over-fire air channel can be arranged in a certain distance above the burner at the same time, and the NOx generation amount of the hearth smoke can be effectively inhibited.
3. The adaptability of coal types is expanded: the combustor can realize solid-gas combustion, solid-liquid combustion and solid-gas-liquid combustion modes, provides good conditions for the stability of pulverized coal flame, and can burn pulverized coal with poor ignition performance and lean pulverized coal with low quality.
4. Multiple combined combustion functions: the technical scheme realizes the combined combustion of gas, liquid and solid phases, provides seven combined modes, and provides a solution for avoiding the civil problem or production accident caused by the shutdown of a boiler or the reduction of load operation when certain fuel is insufficient in storage or supply. Meanwhile, a reference solution is provided for the treatment of low-quality coal, gas and oil.
Drawings
Fig. 1 is a schematic structural view of the blanking device of the present invention.
Wherein, 1 is an outer secondary air annular channel; 2 is an inner secondary air annular channel; 3 is a primary air-powder annular channel; 4 is a central wind annular channel; 5 is a gas channel; 6 is a fuel oil channel; 7 is a gas nozzle; 8 is a coal powder nozzle; 9 is a fuel nozzle; 10 is a central rotational flow device; 11 is an outer secondary air cyclone; 12 is an inner secondary air cyclone; 13 is an external secondary air chamber; 14 is an inner secondary air chamber; 15 is a gas annular header; 16 is a primary air powder chamber; 17 is a central air chamber; 18 is an outer secondary air adjusting plate; 19 is an inner secondary air adjusting plate; 20 is a gas inlet; 21 is a central wind inlet; 22 is a primary air powder inlet; 23 is a fuel inlet; 24 is an outer secondary air inlet; and 25 is an inner secondary air inlet.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 1, the solid-gas-liquid three-phase combined combustion burner comprises a pulverized coal burner, wherein a fuel system and a gas system are arranged in the pulverized coal burner, the fuel system comprises a fuel inlet 23 arranged at the front end of the pulverized coal burner, a fuel channel 6 and a fuel nozzle 9, one end of the fuel channel 6 is connected with the fuel inlet 23, and the other end is connected with the fuel nozzle 9; the gas system comprises a gas inlet 20 connected with the outer wall of the pulverized coal burner, a gas annular header 15, a gas channel 5 and a gas nozzle 7, wherein the gas inlet 20 is connected with the gas annular header 15, and the gas annular header 15 is connected with the gas nozzle 7 through the gas channel 5. The gas inlet 20 is provided at a sidewall of the pulverized coal burner.
A central air system, a primary air system, an inner secondary air system and an outer secondary air system are arranged in the pulverized coal burner, the central air system comprises a central air chamber 17, a central air annular channel 4 connected with the central air chamber 17, and a central cyclone device 10 connected with the central air annular channel 4, and an air outlet of the central cyclone device 10 is connected with a boiler hearth. The fuel passage 6 is disposed in the central plenum 17 and is located at the center of the pulverized coal burner.
The primary air system comprises a primary air inlet 22 and a primary air powder chamber 16 connected with the primary air inlet 22, and the primary air powder chamber 16 is connected with the pulverized coal nozzle 8 through a primary air powder annular channel 3;
the inner secondary air system comprises an inner secondary air inlet 25 and an inner secondary air chamber 14 connected with the inner secondary air inlet 25, the inner secondary air chamber 14 is connected with an inner secondary air cyclone 12 through an inner secondary air annular channel 2, and an air outlet of the inner secondary air cyclone 12 is connected with a boiler hearth.
The outer secondary air system comprises an outer secondary air inlet 24 and an outer secondary air chamber 13 connected with the outer secondary air inlet 24, the outer secondary air chamber 13 is connected with an outer secondary air cyclone 11 through an outer secondary air annular channel 1, and an air outlet of the outer secondary air cyclone 11 is connected with a boiler hearth.
An inner secondary air adjusting plate 19 is arranged at the inner secondary air inlet 25; an outer secondary air adjusting plate 18 is arranged at the outer secondary air inlet 24.
The technical scheme provided by the device is a solid-gas-liquid three-phase combined combustion burner. The technical scheme can be combined into seven combustion modes, namely a mode I and a solid-phase combustion mode; the second mode is a gas-phase combustion mode; the third mode is a liquid phase combustion mode; a fourth mode is a solid-gas two-phase combustion mode; a fifth mode is a solid-liquid two-phase combustion mode; a sixth mode is a gas-liquid two-phase combustion mode; the seventh mode is a solid gas liquid three-phase combustion mode.
The first method is as follows: and a solid-phase combustion mode, namely a pulverized coal combustion mode. The pulverized coal enters the primary air powder chamber 16 from the primary air powder inlet 22 by primary air, the primary air quantity accounts for 2% -6% of the total air quantity, the primary air powder forms rotational flow gas-solid flow under the action of a volute structure of the primary air powder chamber 16, then enters the primary air powder annular channel 3, the flow speed of the rotational flow gas-solid flow in the channel is 18-25 m/s, and finally enters a boiler furnace through the pulverized coal nozzle 8. The central air enters the central air chamber 17 from the central air inlet 21, the central air volume accounts for 10% -18% of the total air volume, the central air enters the central air annular channel 4 after being subjected to reverse flow equalization in the central air chamber 17, the flow velocity of air flow in the channel is 15-23 m/s, and finally, the central air forms rotational flow air flow through the central rotational flow device 10 and enters a boiler furnace. The secondary air is divided into inner secondary air and outer secondary air, and the proportion of the inner secondary air and the outer secondary air can be controlled and adjusted through an inner secondary air adjusting plate 19 and an outer secondary air adjusting plate 18 which are respectively arranged. The inner secondary air enters the inner secondary air chamber 14 from the inner secondary air inlet 25, the inner secondary air accounts for 50% -75% of the total amount of the secondary air, the inner secondary air enters the inner secondary air annular channel 2 after being guided in the inner secondary air chamber 14, the flow velocity of air flow in the channel is 15-27 m/s, and finally, the air flow forms rotational flow through the inner secondary air cyclone 12 and enters a boiler furnace. The outer secondary air enters the outer secondary air chamber 13 from the outer secondary air inlet 24, the outer secondary air accounts for 25% -50% of the total amount of the secondary air, the outer secondary air enters the outer secondary air annular channel 1 after being guided in the outer secondary air chamber 13, the flow velocity of air flow in the channel is 15-32 m/s, and finally, the air flow forms rotational flow air flow or direct flow air flow through the outer secondary air cyclone 11 and enters a boiler furnace. In the combustion mode, the gas system and the fuel system are stopped, a certain amount of secondary air is introduced into the gas system, and a certain amount of compressed air is introduced into the fuel system for cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
The second mode is a gas-phase combustion mode, i.e., a gas combustion mode. Gas with the pressure of about 200kPa enters a gas annular header 15 through a gas inlet 20 after passing through a gas pipeline in front of the boiler, then enters gas channels 5 which are annularly and uniformly distributed in an inner secondary air annular channel 2, the number of the gas channels 5 is 6-24 (the specific number is determined by the power of a burner), and finally enters a boiler hearth under the action of a gas nozzle 7 arranged at the end part of the gas channel 5. The central air, the inner secondary air and the outer secondary air are in the same mode. The coal powder system and the fuel oil system are stopped in the combustion mode, the coal powder system is filled with primary air quantity approximately equal to that in the coal powder combustion mode, and the fuel oil system is filled with a certain amount of compressed air for cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
And the mode III is a liquid phase combustion mode, namely a fuel oil combustion mode. Fuel oil with the pressure of about 1.0-1.5MPa enters the fuel oil channel 6 from the fuel oil inlet 23 after passing through a fuel oil pipeline in front of the boiler, the number of the fuel oil channels 6 is 1, the fuel oil channels are arranged at the central part of the burner, and finally the fuel oil enters a boiler hearth under the action of the fuel oil nozzle 9 arranged at the end part of the fuel oil channel 6. The central air, the inner secondary air and the outer secondary air are in the same mode. The coal powder system and the gas system are stopped in the combustion mode, and a primary air quantity approximately equal to that in the coal powder combustion mode and a certain amount of secondary air are introduced into the gas system for cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
And the mode IV is a solid-gas two-phase combustion mode, namely a coal powder and gas combustion mode. The pulverized coal enters the primary air powder chamber 16 from the primary air powder inlet 22 by primary air, the primary air quantity accounts for 2% -6% of the total air quantity, the primary air powder forms rotational flow gas-solid flow under the action of a volute structure of the primary air powder chamber 16, then enters the primary air powder annular channel 3, the flow speed of the rotational flow gas-solid flow in the channel is 18-25 m/s, and finally enters a boiler furnace through the pulverized coal nozzle 8. Gas with the pressure of about 200kPa enters a gas annular header 15 from a gas inlet after passing through a gas pipeline in front of the boiler, then enters gas channels 5 which are annularly and uniformly distributed in the inner secondary air annular channel 2, the number of the gas channels 5 is 6-24 (the specific number is determined by the power of a burner), and finally the gas enters a boiler hearth under the action of a gas nozzle 7 arranged at the end part of the gas channel. The central air, the inner secondary air and the outer secondary air are in the same mode. In the combustion mode, the fuel system is stopped, and a certain amount of compressed air is introduced into the fuel system for cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
And a fifth mode is a solid-liquid two-phase combustion mode, namely a pulverized coal and fuel oil combustion mode. The pulverized coal enters the primary air powder chamber 16 from the primary air powder inlet 22 by primary air, the primary air quantity accounts for 2% -6% of the total air quantity, the primary air powder forms rotational flow gas-solid flow under the action of a volute structure of the primary air powder chamber 16, then enters a primary air powder annular passage, the flow speed of the rotational flow gas-solid flow in the passage is 18-25 m/s, and finally enters a boiler furnace through a pulverized coal nozzle 8. Fuel oil with the pressure of about 1.0-1.5MPa enters the fuel oil channel 6 from the fuel oil inlet after passing through a fuel oil pipeline in front of the boiler, and finally enters a boiler hearth under the action of a fuel oil nozzle 9 arranged at the end part of the fuel oil channel 6. The central air, the inner secondary air and the outer secondary air are in the same mode. The gas system is stopped in the combustion mode, and a certain amount of secondary air is introduced into the gas system for cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
And a sixth mode is a gas-liquid two-phase combustion mode, namely a gas and fuel combustion mode. Gas with the pressure of about 200kPa enters the gas annular header 15 from the gas inlet after passing through the gas pipeline in front of the boiler, then enters the gas channels 5 which are annularly and uniformly distributed in the inner secondary air annular channel 2, and finally enters the boiler hearth under the action of the gas nozzles 7 arranged at the end parts of the gas channels 5. Fuel oil with the pressure of about 1.0-1.5MPa enters a fuel oil channel from a fuel oil inlet after passing through a fuel oil pipeline in front of the boiler, the number of the fuel oil channels is 1, the fuel oil channels are arranged at the central part of a burner, and finally the fuel oil enters a boiler hearth under the action of a fuel oil nozzle arranged at the end part of the fuel oil channel. The central air, the inner secondary air and the outer secondary air are in the same mode. The coal powder system is stopped in the combustion mode, and the coal powder system is introduced with primary air volume approximately equal to that in the coal powder combustion mode to perform organization combustion and cooling protection. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
And the mode seven is a solid-gas-liquid three-phase combustion mode, namely a pulverized coal, gas and fuel oil combustion mode. The pulverized coal enters the primary air powder chamber 16 from the primary air powder inlet 22 by primary air, the primary air quantity accounts for 2% -6% of the total air quantity, the primary air powder forms rotational flow gas-solid flow under the action of a volute structure of the primary air powder chamber 16, then enters the primary air powder annular channel 3, the flow speed of the rotational flow gas-solid flow in the channel is 18-25 m/s, and finally enters a boiler furnace through the pulverized coal nozzle 8. Gas with the pressure of about 200kPa enters a gas annular header 15 from a gas inlet after passing through a gas pipeline in front of the boiler, then enters gas channels 5 which are annularly and uniformly distributed in the inner secondary air annular channel 2, the number of the gas channels 5 is 6-24 (the specific number is determined by the power of a burner), and finally the gas enters a boiler hearth under the action of a gas nozzle 7 arranged at the end part of the gas channel 5. Fuel oil with the pressure of about 1.0-1.5MPa enters the fuel oil channel 6 from the fuel oil inlet 23 after passing through a fuel oil pipeline in front of the boiler, the number of the fuel oil channels is 1, the fuel oil channels are arranged at the central part of the burner, and finally the fuel oil enters a boiler hearth under the action of a fuel oil nozzle 9 arranged at the end part of the fuel oil channel 6. The central air, the inner secondary air and the outer secondary air are in the same mode. This combustion method is also a typical air staged combustion method, and the amount of NOx produced can be controlled.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (5)
1. A solid-gas-liquid three-phase combined combustion burner comprises a pulverized coal burner and is characterized in that a fuel system and a gas system are arranged in the pulverized coal burner, the fuel system comprises a fuel inlet (23) arranged at the front end of the pulverized coal burner, a fuel channel (6) and a fuel nozzle (9), one end of the fuel channel (6) is connected with the fuel inlet (23), and the other end of the fuel channel is connected with the fuel nozzle (9); the gas system comprises a gas inlet (20) connected with the outer wall of the pulverized coal burner, a gas annular header (15), a gas channel (5) and a gas nozzle (7), wherein the gas inlet (20) is connected with the gas annular header (15), and the gas annular header (15) is connected with the gas nozzle (7) through the gas channel (5).
2. The solid-gas-liquid three-phase combined combustion burner as claimed in claim 1, wherein a central air system, a primary air system, an inner secondary air system and an outer secondary air system are arranged in the pulverized coal burner, the central air system comprises a central air chamber (17), a central air annular channel (4) connected with the central air chamber (17) and a central cyclone device (10) connected with the central air annular channel (4), and an air outlet of the central cyclone device (10) is connected with a boiler furnace;
the primary air system comprises a primary air inlet (22) and a primary air powder chamber (16) connected with the primary air inlet (22), and the primary air powder chamber (16) is connected with the pulverized coal nozzle (8) through a primary air powder annular channel (3);
the inner secondary air system comprises an inner secondary air inlet (25) and an inner secondary air chamber (14) connected with the inner secondary air inlet (25), the inner secondary air chamber (14) is connected with an inner secondary air cyclone (12) through an inner secondary air annular channel (2), and an air outlet of the inner secondary air cyclone (12) is connected with a boiler furnace;
the outer secondary air system comprises an outer secondary air inlet (24) and an outer secondary air chamber (13) connected with the outer secondary air inlet (24), the outer secondary air chamber (13) is connected with an outer secondary air cyclone (11) through an outer secondary air annular channel (1), and an air outlet of the outer secondary air cyclone (11) is connected with a boiler hearth.
3. The solid-gas-liquid three-phase combined combustion burner as claimed in claim 2, wherein the fuel oil passage (6) is arranged in the central air chamber (17) and is positioned at the central position of the pulverized coal burner.
4. The burner for solid-gas-liquid three-phase combined combustion as claimed in claim 2, wherein the gas inlet (20) is provided in a sidewall of the pulverized coal burner.
5. The solid-gas-liquid three-phase combined combustion burner as claimed in claim 2, wherein an inner secondary air adjusting plate (19) is arranged at the inner secondary air inlet (25); an outer secondary air adjusting plate (18) is arranged at the outer secondary air inlet (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021431407.7U CN213066086U (en) | 2020-07-20 | 2020-07-20 | Solid-gas-liquid three-phase combined combustion burner |
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| CN202021431407.7U CN213066086U (en) | 2020-07-20 | 2020-07-20 | Solid-gas-liquid three-phase combined combustion burner |
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