CN108870396B - Pulverized coal and natural gas integrated dual-fuel burner - Google Patents
Pulverized coal and natural gas integrated dual-fuel burner Download PDFInfo
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- CN108870396B CN108870396B CN201810752882.5A CN201810752882A CN108870396B CN 108870396 B CN108870396 B CN 108870396B CN 201810752882 A CN201810752882 A CN 201810752882A CN 108870396 B CN108870396 B CN 108870396B
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- primary air
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 239000003345 natural gas Substances 0.000 title claims abstract description 102
- 239000000446 fuel Substances 0.000 title claims abstract description 36
- 239000003034 coal gas Substances 0.000 title claims description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 42
- 230000009977 dual effect Effects 0.000 claims abstract description 4
- 239000003245 coal Substances 0.000 claims description 59
- 239000007789 gas Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000013507 mapping Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000002737 fuel gas Substances 0.000 claims description 2
- 239000002817 coal dust Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 13
- 239000002131 composite material Substances 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
- F23D17/005—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
- F23Q13/02—Igniters not otherwise provided for using gas burners, e.g. gas pokers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2204/00—Burners adapted for simultaneous or alternative combustion having more than one fuel supply
- F23D2204/20—Burners adapted for simultaneous or alternative combustion having more than one fuel supply gaseous and pulverulent fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The utility model provides a buggy and natural gas integral type dual fuel combustor, including axial parallel's primary air and buggy passageway and natural gas passageway, natural gas passageway is in primary air and buggy passageway, primary air and buggy passageway from before has arranged in proper order on primary air and the buggy passageway, interior overgrate air subassembly and outer overgrate air subassembly, primary air and buggy entry are located primary air and buggy passageway subassembly's front portion, central combustion-supporting wind subassembly has been arranged on the natural gas passageway, natural gas entry is located central combustion-supporting wind subassembly front portion, the exit linkage prechamber of primary air and buggy passageway, the export of natural gas passageway is provided with the natural gas nozzle subassembly, the natural gas nozzle subassembly is located the prechamber. The invention effectively combines the coal dust and the natural gas combustion technology, can independently burn the coal dust and the natural gas, simultaneously can perform dual-fuel composite combustion, is convenient for a user to select, and simultaneously improves the reliability of fuel supply in long-term continuous operation of the boiler.
Description
Technical Field
The invention belongs to the technical field of boiler burners, and particularly relates to a pulverized coal and natural gas integrated dual-fuel burner.
Background
In the existing boiler combustion equipment in China, the fuel oil burner, the pulverized coal burner and the gas burner are common, but are all single combustion technologies, when the fuel is changed, the corresponding burner also needs to be replaced, even the boiler body and the combustion system need to be modified, great inconvenience and great economic cost are caused for users, and therefore, the provision of a reliable pulverized coal and natural gas integrated dual-fuel burner is very necessary. In addition, along with the increasing market demand, at present, a small number of enterprises simply and mechanically combine the coal dust and the natural gas, namely, two independent burners of coal dust and gas are installed on one boiler for use, and the mode has the advantages of large limitation, high investment and unsatisfactory effect.
In addition, boiler burners generally use a single fuel for combustion operation, typically pulverized coal, oil or natural gas is combusted separately, and few sophisticated dual fuel burners are in use. Along with further tightening of national environmental protection policies, the tide of changing coal into gas in various places is spreading well, but the comprehensive and sufficient supply of natural gas has certain difficulty at present, and meanwhile, the natural gas is a large country for coal production, the clean and efficient utilization of coal is realized, and the market space is still quite large. The number of coal-fired boilers currently in operation in China is huge, and quite long transition period is required for comprehensively implementing the policy of changing coal into gas in China, so that the development of a pulverized coal and gas dual-fuel combustion device for meeting market demands is very necessary. At present, about 70% of power plants in China still use the coal-fired thermal power technology, and more than 90% of boilers in thermal power plants use pulverized coal boilers, so that the pulverized coal boilers are the most mature and most widely applied coal-fired boiler forms of the present coal-fired efficient clean utilization technology. Natural gas is a relatively clean fuel because of its nitrogen-free composition. At present, the domestic natural gas burner is basically a foreign product introduced, is a single natural gas combustion technology, and has no relation with the pulverized coal combustion technology.
In summary, the disadvantages of the existing burner are mainly represented by:
1. the existing boiler burner uses single fuel, has single combustion function, and cannot adapt to the change of the fuel.
2. The dual-fuel boiler with simple composition has high investment, large occupied area and inconvenient running and operation.
3. The operation safety is poor, and the low-nitrogen combustion effect is not ideal.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the pulverized coal and natural gas integrated dual-fuel burner which effectively combines the pulverized coal and natural gas combustion technology, can independently burn pulverized coal and natural gas, and can also independently burn dual-fuel composite combustion. Because the burner is integrated, the same boiler has the function of using two fuels, and can realize overall planning, unified management, centralized operation modes in the aspects of control, installation, auxiliary facility construction and the like, thereby greatly facilitating the selectivity of vast users in the transition and popularization period of the coal-to-gas policy and improving the reliability of fuel supply in the long-term continuous operation of the boiler.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides a buggy and natural gas integrated dual fuel combustor, includes axial parallel primary air and buggy passageway 13 and natural gas passageway 14, and natural gas passageway 14 has arranged primary air and buggy passageway 15, interior overgrate air subassembly 6 and outer overgrate air subassembly 7 on primary air and buggy passageway 13 from the front and then in proper order on the primary air and buggy passageway 13, and primary air and buggy entry 5 are located the front portion of primary air and buggy passageway 15, the last central combustion-supporting wind subassembly 4 that has arranged of natural gas passageway 14, natural gas entry 1 is located the front portion of central combustion-supporting wind subassembly 4, and the exit linkage prechamber 10 of primary air and buggy passageway 13, and the export of natural gas passageway 14 is provided with natural gas burner subassembly 8, and natural gas burner subassembly 8 is located prechamber 10.
The primary air and the pulverized coal inlet 5 are vertically upwards and are vertical to the primary air sleeve, the primary air and the pulverized coal inlet 5 are connected into a primary air and pulverized coal mixture sent by a pulverized coal storage and supply system, and the primary air and pulverized coal mixture is sent into the combustor precombustor 10 through a primary air and pulverized coal channel 13 and is mixed and combusted with inner and outer overgrate air provided by the inner overgrate air component 6 and the outer overgrate air component 7; natural gas from the natural gas outlet channel 14 is sprayed out by the gas burner assembly 8 and the central swirl nozzle 9 and enters the precombustion chamber 10 to be mixed and combusted with central combustion-supporting air and inner and outer overgrate air provided by the inner overgrate air assembly 6 and the outer overgrate air assembly 7.
The central combustion-supporting air is premixed air of natural gas, and the premixed amount is comprehensively adjusted according to the safe and reliable low-nitrogen combustion effect.
The inner secondary air provided by the inner secondary air component 6 consists of two paths of air distribution of inner secondary direct current air and inner secondary rotational flow air; the outer overgrate air subassembly 7 and the precombustion chamber 10 are integrated into a whole to form a precombustion chamber structure with a preheating SOFA, and outer overgrate air nozzles are in a tangential rotational flow mode and are uniformly distributed near the outlet of the precombustion chamber 10 around the circumference of the inner wall of the precombustion chamber 10.
The primary air and pulverized coal channel 13 is provided with a concentration separation device 13a, so that pulverized coal in the primary air forms a central concentrated phase area and a peripheral dilute phase area when entering the precombustion chamber 10.
The thick and thin separation device 13a is positioned at the outlet end of the primary air and coal dust channel 13 and consists of an annular guide cone embedded in the primary air and coal dust channel 13 and flame stabilizing teeth at the outlet.
Because of the centripetal injection action and the flame stabilizing tooth blocking action of the annular guide cone, most of pulverized coal particles in the primary air and pulverized coal mixture can be gathered to the flame central part of the burner to form a concentrated phase region, and the outer flame and the periphery are made into a dilute phase region with lower pulverized coal concentration.
The primary air and the coal dust inlet 5 are vertically upwards, the natural gas inlet 1 is vertically downwards, and the central air combustion-supporting air inlet is vertically upwards at the position of the natural gas inlet 1.
The natural gas burner assembly 8 is composed of a plurality of small-sized uniform-fire nozzles, so that natural gas flames are composed of a plurality of small torches which are uniformly distributed on the circumference.
The ignition device 3 of the natural gas is arranged at the front end of a natural gas channel 14 and horizontally installed, the ignition device 3 mainly comprises a small gas spray gun, a high-energy ignition rod and a pneumatic propeller, the small gas spray gun and the ignition rod in the ignition device are integrally connected with a central pipe of a burner through mounting flanges, are parallel to the natural gas channel 14 and penetrate through the central pipe to reach the positions of a gas burner assembly 8 and a central swirl nozzle 9, so that high-flow natural gas sprayed out of the gas burner assembly 8 and the central swirl nozzle 9 is ensured to be ignited in time, the small natural gas flame is adopted to preheat the precombustion chamber 10, the ignition device is driven by the pneumatic propeller when ignition, the ignition gun stretches into the precombustion chamber 10, and exits from the precombustion chamber 10 after ignition is completed, and the ignition gun is far away from a high-temperature area.
The precombustion chamber 10 is internally provided with a flame detector 11 and a thermocouple thermometer 12 which are respectively and radially arranged on the shell of the precombustion chamber and are used for detecting flame signals and temperature signals in the precombustion chamber 10.
Compared with the prior art, the dual-fuel burner can independently burn pulverized coal, independently burn natural gas, and can also use two fuels of pulverized coal and natural gas for compound combustion, so that the pulverized coal and the natural gas use one set of equipment to realize safe, efficient and clean combustion. The integrated whole equipment has the advantages of simple installation, small occupied space, simple connection with the boiler design, centralized control and auxiliary supporting facilities, convenient operation and running, high reliability, strong safety and the like.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a view in the direction B in fig. 1.
Fig. 3 is a flow chart of the operation of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the pulverized coal and natural gas integrated dual-fuel burner comprises a primary air and pulverized coal channel 13 and a natural gas channel 14 which are coaxial, wherein the natural gas channel 14 is arranged in the primary air and pulverized coal channel 13, and a primary air and pulverized coal channel assembly 15, an inner overgrate air assembly 6 and an outer overgrate air assembly 7 are sequentially arranged on the primary air and pulverized coal channel 13 from front to back.
The primary air and the pulverized coal inlet 5 are vertically upwards and positioned at the front part of the primary air and pulverized coal channel assembly 15 and are vertical to the primary air sleeve. The natural gas channel 14 is provided with a central combustion-supporting air assembly 4, the natural gas inlet 1 is vertically downward and positioned in front of the central combustion-supporting air assembly 4, and the central combustion-supporting air inlet is vertically upward at the position of the natural gas inlet 1. The outlets of the primary air and coal dust channels 13 are connected with the precombustor 10, the outlets of the natural gas channels 14 are provided with a natural gas burner assembly 8 and a central swirl nozzle 9, the natural gas burner assembly 8 is positioned in the precombustor 10 and consists of a plurality of small-sized uniform-fire nozzles, and the natural gas burner assembly surrounds the central swirl nozzle 9, so that the natural gas flame consists of a plurality of small torches uniformly distributed on the circumference, the temperature in the natural gas flame can be uniform, and thermal nitrogen oxides generated due to local high temperature are avoided to the greatest extent.
The ignition device 3 of natural gas is arranged at the front end of a natural gas channel 14 and horizontally installed, the ignition device 3 mainly comprises a small gas spray gun, a high-energy ignition rod, a pneumatic propeller and the like, the ignition device is integrally connected with a central pipe of a burner through a mounting flange, the small gas spray gun and the ignition rod in the ignition device are parallel to the natural gas channel 14 and pass through the central pipe to reach the positions of a natural gas burner assembly 8 and a central swirl nozzle 9, so that the large-flow natural gas sprayed by the gas burner assembly 8 and the central swirl nozzle 9 is ignited in time, the pre-combustion chamber 10 is preheated by adopting small natural gas flames, the effect of rapidly and safely igniting a large amount of natural gas sprayed by the pulverized coal and the natural gas burner assembly 8 is achieved, the ignition device is driven by the pneumatic propeller when ignition, the ignition gun stretches into the pre-combustion chamber 10, the ignition gun exits from the pre-combustion chamber 10 after ignition is completed, the ignition gun is far away from a high-temperature area, and the ignition gun is prevented from being in the high-temperature flame for a long time, and the service life is shortened.
The primary air and coal powder inlet 5 is connected with the primary air and coal powder mixture sent by the coal powder storage and supply system, and is sent into the combustor precombustion chamber 10 through the primary air and coal powder channel 13, and is mixed and combusted with the inner secondary air provided by the inner secondary air component 6 and the outer secondary air component 7.
Natural gas from the natural gas outlet channel 14 is sprayed out by the gas burner assembly 8 and the central swirl nozzle 9 and enters the precombustion chamber 10 to be mixed and combusted with central combustion-supporting air and inner and outer overgrate air provided by the inner overgrate air assembly 6 and the outer overgrate air assembly 7.
The flame detector 11 and the thermocouple thermometer 12 are arranged in the precombustion chamber 10 and are respectively and radially arranged on the shell of the precombustion chamber, and are used for detecting flame signals and temperature signals in the precombustion chamber 10, so that references are provided for fire extinguishing protection and combustion state adjustment of the burner.
The central combustion-supporting air is premixed air of natural gas, and the premixed amount is comprehensively adjusted according to the safe and reliable low-nitrogen combustion effect.
The inner secondary air component 6 is positioned in the middle of the burner main body, the inner secondary air consists of two paths of air distribution of inner secondary direct current air and inner secondary rotational flow air, the direct current air has strong penetrating power and long jet flow travel, the rigidity of flame can be enhanced, the rotational flow intensity of rotational flow air is high, the rotational flow air can be rapidly mixed with primary air and coal dust or fuel gas, the disturbance in the precombustion chamber of the burner can be sufficient, and the required oxygen demand is provided for the initial stage of ignition of the coal dust and natural gas.
The outer overgrate air subassembly 7 and prechamber 10 combine together, form the prechamber structure with preheating type SOFA, and outer overgrate air spout is tangential whirl mode, around prechamber 10 inner wall circumference equipartition near prechamber 10 export, can form near the combustor export and take up the backward flow district, can play obvious steady burning effect on the one hand, on the other hand has prolonged the air jet stroke of combustor, makes the air classification distance of combustor enlarge, can effectively simulate the formation of nitrogen oxide.
The primary air and pulverized coal channel 13 is internally provided with a concentration separation device 13a, so that pulverized coal in the primary air forms a central concentrated phase area and a peripheral dilute phase area when entering the precombustion chamber 10, thereby creating conditions for low-nitrogen combustion of the pulverized coal. The thick and thin separation device 13a is positioned at the outlet end of the primary air and coal dust channel 13 and consists of an annular guide cone embedded in the primary air and coal dust channel 13 and flame stabilizing teeth at the outlet. Because of the centripetal injection action and the flame stabilizing tooth blocking action of the annular guide cone, most of pulverized coal particles in the primary air and pulverized coal mixture can be gathered to the flame central part of the burner to form a concentrated phase region, and the outer flame and the periphery are made into a dilute phase region with lower pulverized coal concentration.
Referring to fig. 3, the operation of the present invention is as follows:
and the starting system is used for detecting whether the ignition condition is met, if so, the ignition is allowed, the gas pressure is detected, the ignition system is started in situ or remotely, and is sent into the combined mapping ignition air gun, the high-energy igniter is started, the flame detector is started after 30 seconds, and the ignition gas electromagnetic valve is opened. If the ignition is unsuccessful, the ignition electromagnetic valve is closed, the alarm is given, the purging is started, the reset is carried out after the fault is detected, and the starting is carried out again.
After ignition is successful, an operation mode comprising three modes of pulverized coal, natural gas and mixed combustion is selected according to the condition of fuel, under the independent combustion mode of the pulverized coal, firstly, whether a precombustion chamber reaches the preset temperature for powder injection is detected, if so, the pulverized coal is injected, a combustion-supporting blower is started after ignition is successful, after the condition of gun withdrawal is reached, a gas electromagnetic valve is closed, main flame is kept monitored, then a combined mapping ignition air gun is withdrawn, the thermal load is regulated, and the stable operation is realized.
Under the independent combustion mode of natural gas, the main gas valve is directly opened, the combined mapping ignition air gun is withdrawn after ignition is successful, the combustion-supporting fan is started, the main flame is kept monitored, and then the heat load is regulated to operate stably.
In the mixed combustion mode, the two portions are required to operate simultaneously.
Therefore, the integrated dual-fuel burner can realize multiple purposes, is applicable to three types of bituminous coal powder and natural gas as fuels, can be used for combustion respectively, and can also be used for mixed combustion of two fuels simultaneously. The combustion function of the solid fuel and the gas fuel is concentrated in one burner, so that the combustion of the solid fuel and the gas fuel with different forms by using the same burner is realized, and the safe, efficient, clean and simple operation effect can be achieved. In the control of pulverized coal combustion emission, the invention applies the technologies of pulverized coal concentration separation, grading air distribution, recycling flue gas, a precombustion chamber with preheating type SOFA and the like, and can simulate the NOx generation amount of about 40 percent. In the aspect of natural gas combustion emission control, the invention applies the semi-premixing technology, the multi-burner uniform cremation technology, the air classification technology, the flue gas recirculation technology and other technologies, and can control the NOx emission to be below 50mg/m 3. In the aspect of safe operation control, the invention mainly provides a reliable fire-extinguishing interlocking protection function, namely a composite flame detector and a thermocouple with reliable application performance, by carrying out real-time monitoring analysis on flame spectrums and prechamber temperatures during combustion of coal dust and natural gas, comprehensively judging, timely outputting fire-extinguishing signals to a combustion control system, then automatically sending out cut-off fuel (coal dust and gas) supply by the control system, starting a burner and hearth purging program, so that abnormal fire-extinguishing conditions are effectively treated in time, safety accidents caused by abnormal fire extinguishment are avoided, and safe operation of boiler combustion is ensured.
Claims (5)
1. The utility model provides a buggy and natural gas integrated dual fuel burner, its characterized in that includes axial parallel primary air and buggy passageway (13) and natural gas passageway (14), and natural gas passageway (14) are in primary air and buggy passageway (13), and primary air and buggy passageway (13) are last to have arranged in proper order from the front then primary air and buggy passageway subassembly (15), interior overgrate air subassembly (6) and outer overgrate air subassembly (7), and primary air and buggy entry (5) are located the front portion of primary air and buggy passageway subassembly (15), be arranged on natural gas passageway (14) central combustion-supporting wind subassembly (4), natural gas entry (1) are located the front portion of central combustion-supporting wind subassembly (4), and the exit linkage prechamber (10) of primary air and buggy passageway (13), the export of natural gas passageway (14) is provided with natural gas burner subassembly (8), and natural gas burner subassembly (8) are located prechamber (10);
The primary air and the pulverized coal inlet (5) are vertically upwards and are vertical to the primary air sleeve, the primary air and the pulverized coal inlet (5) are connected into a primary air and pulverized coal mixture sent by a pulverized coal storage and supply system, and the primary air and pulverized coal mixture is sent into a combustor precombustion chamber (10) through a primary air and pulverized coal channel (13) and is mixed with inner and outer secondary air provided by an inner secondary air component (6) and an outer secondary air component (7) for combustion; natural gas discharged from the natural gas channel (14) is sprayed out by the gas burner assembly (8) and the central swirl nozzle (9) and then enters the precombustion chamber (10), and is mixed with central combustion-supporting air, inner secondary air provided by the inner secondary air assembly (6) and outer secondary air provided by the outer secondary air assembly (7) for combustion, wherein the central combustion-supporting air is premixed air of the natural gas, and the premixing amount is comprehensively adjusted according to the safe and reliable low-nitrogen combustion effect;
the inner secondary air provided by the inner secondary air component (6) consists of two paths of air distribution of inner secondary direct current air and inner secondary rotational flow air; the outer secondary air component (7) and the precombustion chamber (10) are integrated into a whole to form a precombustion chamber structure with a preheating SOFA, and outer secondary air nozzles are in a tangential rotational flow mode and are uniformly distributed near the outlet of the precombustion chamber (10) around the circumference of the inner wall of the precombustion chamber (10);
The natural gas burner assembly (8) consists of a plurality of small-sized uniform-fire nozzles, so that natural gas flames consist of a plurality of small torches which are uniformly distributed on the circumference;
The ignition device (3) for the natural gas is arranged at the front end of a natural gas channel (14), is horizontally arranged, the ignition device (3) mainly comprises a small gas spray gun, a high-energy ignition rod and a pneumatic propeller, is integrally connected with a central pipe of a burner through a mounting flange, the small gas spray gun and the ignition rod in the ignition device are parallel to the natural gas channel (14) and penetrate through the central pipe to reach the positions of a gas burner assembly (8) and a central swirl nozzle (9), so that the large-flow natural gas sprayed by the gas burner assembly (8) and the central swirl nozzle (9) is ensured to be ignited in time, the small natural gas flame is adopted to preheat a precombustion chamber (10), the pneumatic propeller is used for driving the ignition gun to extend into the precombustion chamber (10) when ignition is finished, and the ignition gun is far away from a high-temperature region;
after ignition is successful, selecting an operation mode comprising three modes of pulverized coal, natural gas and mixed combustion according to the condition of fuel, under the independent combustion mode of the pulverized coal, firstly detecting whether a precombustion chamber reaches a preset powder feeding temperature, if so, feeding the pulverized coal, starting a combustion-supporting blower after ignition is successful, closing a fuel gas electromagnetic valve after a gun withdrawal condition is reached, keeping monitoring main flame, and then exiting a combined mapping ignition air gun, adjusting heat load and stabilizing operation;
Under the independent natural gas combustion mode, directly opening a main gas valve, after ignition is successful, exiting the combined mapping ignition gas gun, starting a combustion-supporting fan, keeping monitoring main flame, and then regulating the thermal load to stably operate;
in the mixed combustion mode, the two portions are required to operate simultaneously.
2. The pulverized coal and natural gas integrated dual-fuel burner as claimed in claim 1, wherein a concentration separation device (13 a) is arranged in the primary air and pulverized coal channel (13), so that pulverized coal in the primary air forms a central concentrated phase area and a peripheral dilute phase area when entering the precombustion chamber (10).
3. The pulverized coal and natural gas integrated dual-fuel burner as claimed in claim 2, wherein the thick and thin separation device (13 a) is positioned at the outlet end of the primary air and pulverized coal channel (13) and consists of an annular guide cone embedded in the primary air and pulverized coal channel (13) and flame stabilizing teeth at the outlet.
4. The pulverized coal and natural gas integrated dual-fuel burner according to claim 1, characterized in that the primary air and pulverized coal inlet (5) is vertically upwards, the natural gas inlet (1) is vertically downwards, and the central air combustion-supporting air inlet is vertically upwards at the position of the natural gas inlet (1).
5. The pulverized coal and natural gas integrated dual-fuel burner according to claim 1, wherein a flame detector (11) and a thermocouple thermometer (12) are arranged in the precombustor (10), and are radially arranged on the outer shell of the precombustor respectively and used for detecting flame signals and temperature signals in the precombustor (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752882.5A CN108870396B (en) | 2018-07-10 | 2018-07-10 | Pulverized coal and natural gas integrated dual-fuel burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752882.5A CN108870396B (en) | 2018-07-10 | 2018-07-10 | Pulverized coal and natural gas integrated dual-fuel burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108870396A CN108870396A (en) | 2018-11-23 |
| CN108870396B true CN108870396B (en) | 2024-08-13 |
Family
ID=64300783
Family Applications (1)
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| CN111847907B (en) * | 2019-04-25 | 2021-12-03 | 中冶长天国际工程有限责任公司 | Lime kiln and heat supply method thereof |
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| CN112594689B (en) * | 2020-12-15 | 2021-11-05 | 北京理工大学 | High-temperature high-speed stable combustion method and device based on multistage jet flow and rotational flow |
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| CN114811575B (en) * | 2022-04-19 | 2023-04-25 | 东方电气集团东方锅炉股份有限公司 | Coal-fired and natural gas dual-purpose boiler system and application method thereof |
| CN115654740A (en) * | 2022-12-27 | 2023-01-31 | 江苏羚羊建材科技有限公司 | Hot blast stove equipment suitable for various fuels |
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