CN102116480A - Industrial pulverized coal swirl combustion system using natural gas for supporting combustion - Google Patents
Industrial pulverized coal swirl combustion system using natural gas for supporting combustion Download PDFInfo
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- CN102116480A CN102116480A CN 201110054987 CN201110054987A CN102116480A CN 102116480 A CN102116480 A CN 102116480A CN 201110054987 CN201110054987 CN 201110054987 CN 201110054987 A CN201110054987 A CN 201110054987A CN 102116480 A CN102116480 A CN 102116480A
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Abstract
The invention relates to an industrial pulverized coal swirl combustion system using natural gas for supporting combustion, and a central air channel, a primary air channel, a direct-flow natural gas channel, an internal swirl secondary air channel and an external swirl secondary air channel are sequentially superposed and arranged from inside to outside around the outer side surface of an ignition gun. The combustion system can improve a temperature field and enhance heat transfer by radiation with the help of the natural gas for supporting the combustion, and has the advantages of uniform rich-lean distribution of pulverized coal, high combustion efficiency, good combustion stability, extensive adaptability to coal types and low NOx emission.
Description
Technical field
The present invention relates to a kind of industrial pulverized coal combustion system, be specifically related to the combustion-supporting industrial pulverized coal whirl burning system of a kind of natural gas.
Background technology
After advanced combustion technology such as coal powder light-dark technology and grading combustion technology occurs, the swirl flow combustion system not only can highly organized Furnace Aerodynamic Field, produce rational ignition zone breeze airflow CONCENTRATION DISTRIBUTION and the pulverized coal particle time of staying and ignition distance, guarantee smooth combustion, and can reduce NO in a large number
XThe gas discharging.Advantages such as simultaneously, the burning of swirl flow combustion system has relative independence, and layout is all relative flexible with adjustment, and the deviation of flue gas temperature of hearth outlet and vapor (steam) temperature is less.Therefore, the swirl flow combustion system has obtained using widely on the large-scale power station coal-burning boiler.
But at present the swirl flow combustion system that uses still exists postponements of catching fire, colm to catch fire difficulty, combustion instability, low-load combustion-stabilizing ability, slagging scorification seriously and NO in actual motion
XProblems such as discharge capacity exceeds standard.Tracing it to its cause, mainly is because China's steam coal presents the characteristics that coal is changeable, ature of coal is relatively poor.Especially in middle-size and small-size industrial coal powder boiler and industrial furnace or industry kiln, compare with station boiler, furnace cavity is little, and the coal dust time of staying is short, and the coal dust burn-off rate is low, and efficiency of combustion is low; Simultaneously, middle-size and small-size industrial coal powder boiler and industrial furnace or industry kiln, capacity is little, fractional cold is big, and the single layout of combustion system lacks and ignites mutually, cause the fire box temperature level lower, the steady combustion ability of combustion system and poor to the adaptive capacity of coal is difficult to the effective and economic burning of tissue.In order to adapt to the changeable and increasingly serious environmental requirement of ature of coal, the coal adaptive capacity of industrial coal powder boiler, low-load combustion-stabilizing ability and low NO
XEmission request improves constantly.
Although also have at present some swirl flow combustion systems generally to adopt to strengthen the swirl strength of wind and secondary wind, or a wind outlet installs steady combustion tooth or steady combustion ring additional, or changes technology such as combustion system outlet shape and improve combustion position.But in the face of the structure particularity of middle-size and small-size industrial coal powder boiler and industrial furnace or industry kiln, existing small and medium-sized industrial coal powder boilers swirl flow combustion system is for adaptability, low-load combustion-stabilizing ability and the low NO of coal
XThe defective of discharging aspect is not still solved well.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the object of the present invention is to provide the combustion-supporting industrial pulverized coal whirl burning system of a kind of natural gas, by overlapping successively center wind duct, wind passage, direct current natural gas passage, interior eddy flow secondary air channel and outer eddy flow secondary air channel of being provided with of lateral surface from-inner-to-outer around burning torch, this combustion system can be combustion-supporting by natural gas, improve the temperature field and strengthen radiant heat transfer, have that coal powder light-dark is evenly distributed, the efficiency of combustion height, combustion stability is good, coal adaptability is wide and low NO
XThe advantage of discharging.
In order to achieve the above object, the technical solution adopted in the present invention is:
The industrial pulverized coal whirl burning system that a kind of natural gas is combustion-supporting, comprise that right-hand member is the horizontal column burning torch 1 of burning torch mouth, around the lateral surface from-inner-to-outer of burning torch 1 is overlapping successively the horizontal columns ring center wind passage 2 that left side upper surface has center wind inlet 102 is set, left end has wind path 10 of horizontal columns ring-type of a wind inlet 101 of vertical direction bending, left end has the horizontal columns ring-type direct current natural gas passage 3 of the direct current gas inlet 103 of vertical direction, left end has the outer eddy flow secondary air channel 12 of horizontal columns ring-type that eddy flow secondary air channel 11 in the horizontal columns ring-type of interior swirl secondary air inlet 104 of vertical direction and left end have the outer swirl secondary air inlet 105 of vertical direction, and burning torch 1 in addition, center wind duct 2, a wind path 10, direct current natural gas passage 3, the right side in the vertical direction of interior eddy flow secondary air channel 11 and outer eddy flow secondary air channel 12 is mutually concordant.
The right-hand member exit of the right-hand member exit of eddy flow secondary air channel 11 and outer eddy flow secondary air channel 12 is respectively arranged with in described eddy flow secondary air channel enlarging 9 and outer eddy flow secondary air channel enlarging 16 in the horizontal circle of the same horizontal center line axis frustum ring-type with it.
Described direct current natural gas channel outlet 106 is a horizontal circle frustum ring, and the left side of this horizontal circle frustum ring is little and the right side is big, also has in the horizontal circle frustum ring in addition from the horizontal circle band of column of its left side level incision.
Described direct current gas inlet 103 is provided with natural gas quick-break valve 4.
Described direct current natural gas channel outlet 106 places are provided with spark arrester 7.
The horizontal Eight characters frustum ring-type Pulverized Coal Concentration device 5 that same horizontal center line axis is arranged with it is set in described wind path 10, and the left side of this Pulverized Coal Concentration device 5 is little and the right side is big.
A described wind path 10 right-hand member exit is provided with circular tooth shape structure smooth combustion apparatus 15, and this circular tooth shape structure smooth combustion apparatus 15 is a circulus, and this circulus inwall is along the circumferential evenly distributed circular arc column coal-powder steady flame tooth 19 that has more than three at interval.
Be provided with axial adjustable cyclone 6 in the eddy flow secondary air channel 11 in described.
Described outer swirl secondary air 105 ecto-entads that enter the mouth are provided with outer secondary wind successively and transfer windshield plate 14 and tangential adjustable cyclone 13.
By around overlapping successively center wind duct 2, wind path 10, direct current natural gas passage 3, interior eddy flow secondary air channel 11 and the outer eddy flow secondary air channel 12 of being provided with of the lateral surface from-inner-to-outer of burning torch 1, this structure makes this combustion system by the combustion-supporting raising of natural gas temperature field with strengthen radiant heat transfer, have coal powder light-dark be evenly distributed the efficiency of combustion height, combustion stability is good, coal adaptability is wide and low NO
XThe advantage of discharging.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structure cutaway view of Pulverized Coal Concentration device of the present invention.
Fig. 3 is the structure half sectional view of direct current natural gas channel outlet of the present invention.
Fig. 4 is the structural representation of circular tooth shape structure smooth combustion apparatus of the present invention.
The specific embodiment
The present invention will be described in more detail below in conjunction with accompanying drawing.
As shown in Figure 1, the industrial pulverized coal whirl burning system that natural gas is combustion-supporting, comprise that right-hand member is the horizontal column burning torch 1 of burning torch mouth, around the lateral surface from-inner-to-outer of burning torch 1 is overlapping successively the horizontal columns ring center wind passage 2 that left side upper surface has center wind inlet 102 is set, left end has wind path 10 of horizontal columns ring-type of a wind inlet 101 of vertical direction bending, left end has the horizontal columns ring-type direct current natural gas passage 3 of the direct current gas inlet 103 of vertical direction, left end has the outer eddy flow secondary air channel 12 of horizontal columns ring-type that eddy flow secondary air channel 11 in the horizontal columns ring-type of interior swirl secondary air inlet 104 of vertical direction and left end have the outer swirl secondary air inlet 105 of vertical direction, and burning torch 1 in addition, center wind duct 2, a wind path 10, direct current natural gas passage 3, the right side in the vertical direction of interior eddy flow secondary air channel 11 and outer eddy flow secondary air channel 12 is mutually concordant.The right-hand member exit of the right-hand member exit of eddy flow secondary air channel 11 and outer eddy flow secondary air channel 12 is respectively arranged with in described eddy flow secondary air channel enlarging 9 and outer eddy flow secondary air channel enlarging 16 in the horizontal circle of the same horizontal center line axis frustum ring-type with it, introduce direct current natural gas passage 3 and import natural gas, because the Flow-rate adjustment of natural gas more flexibly accurately, combustibility is more superior, when boiler load changes, add and adopt natural gas combustion-supporting between wind and the secondary wind, can carry out coal dust, natural gas is adjusted simultaneously, steady combustion under stable operation, the especially underload of assurance combustion system.Natural gas consumes certain oxygen, thereby can form the reproducibility zone of anoxic in the part in combustion system outlet burning rapidly, suppresses fuel type NO
XGeneration, the NO that has produced
XAlso reducible one-tenth N under reducing atmosphere
2, can effectively reduce the NO that produces in the combustion process
XIn addition, the raising of temperature helps the separating out of coal dust volatile matter, burning and the fine grain burning of coal dust, improve efficiency of combustion and fuel availability, add that combustion-supporting natural gas feeds by the direct current mode, make to produce backflow among a small circle, form the lower slightly transition region of one deck oxygen supply in this combustion system exit.As shown in Figure 3, described direct current natural gas channel outlet 106 is a horizontal circle frustum ring, and the left side of this horizontal circle frustum ring is little and the right side is big, also has in the horizontal circle frustum ring in addition from the horizontal circle band of column of its left side level incision.Described direct current gas inlet 103 is provided with natural gas quick-break valve 4, and natural gas quick-break valve 4 can cut off combustion-supporting natural gas rapidly, guarantees the safe operation of combustion system.Described direct current natural gas channel outlet 106 places are provided with spark arrester 7, and spark arrester 7 can play the better buffer action of natural gas in conjunction with described horizontal circle frustum ring, prevent that secondary wind from adding burning too early, makes NO
XThe reducing zone obtains proper extension, more can reduce NO
XDischarging.As shown in Figure 2, the horizontal Eight characters frustum ring-type Pulverized Coal Concentration device 5 that same horizontal center line axis is arranged with it is set in described wind path 10, the left side of this Pulverized Coal Concentration device 5 is little and the right side is big, when such wind carries coal dust by this enrichment facility 5, can be divided into radially Fu Fenliu and poor powder stream, so that close combustion-supporting natural gas side is the high coal powder density district of rich powder, and concentrating of coal dust not only helps catching fire and reducing NO
XDischarging, this zone is owing to natural gas is combustion-supporting, and temperature levels is higher, thereby has formed a high coal powder density high-temperature zone, can effectively improve the steady combustion performance of combustion system.As shown in Figure 4, a described wind path 10 right-hand member exit is provided with circular tooth shape structure smooth combustion apparatus 15, this circular tooth shape structure smooth combustion apparatus 15 is a circulus, and this circulus inwall is along the circumferential evenly distributed circular arc column coal-powder steady flame tooth 19 that has more than three at interval.Be provided with axial adjustable cyclone 6 in the eddy flow secondary air channel 11 in described.Described outer swirl secondary air 105 ecto-entads that enter the mouth are provided with outer secondary wind successively and transfer windshield plate 14 and tangential adjustable cyclone 13.
Operation principle of the present invention is: open the natural gas quick-break valve 4 of direct current gas inlet 103 and the secondary wind of outer swirl secondary air inlet 105 and transfer windshield plate 14, center wind by center wind duct 2 enters the mouth 102 subsequently, a wind inlet 101 of a wind path 10, the outer swirl secondary air inlet 105 of the interior swirl secondary air inlet 104 of interior eddy flow secondary air channel 11 and outer eddy flow secondary air channel 12 feeds the air-flow that has coal dust, and the direct current gas inlet 103 by direct current natural gas passage 3 feeds natural gas, form the mixture that the air-flow that has coal dust and natural gas are formed like this in separately exit, firing point firelock 1 is lighted this mixture simultaneously.
By around overlapping successively center wind duct 2, wind path 10, direct current natural gas passage 3, interior eddy flow secondary air channel 11 and the outer eddy flow secondary air channel 12 of being provided with of the lateral surface from-inner-to-outer of burning torch 1, this structure makes this combustion system by the combustion-supporting raising of natural gas temperature field with strengthen radiant heat transfer, have coal powder light-dark be evenly distributed the efficiency of combustion height, combustion stability is good, coal adaptability is wide and low NO
XThe advantage of discharging.
Claims (9)
1. the combustion-supporting industrial pulverized coal whirl burning system of a natural gas, comprise that right-hand member is the horizontal column burning torch (1) of burning torch mouth, it is characterized in that: the horizontal columns ring center wind passage (2) that left side upper surface has center wind inlet (102) is set around the lateral surface from-inner-to-outer of burning torch (1) is overlapping successively, left end has a wind passage of horizontal columns ring-type (10) of a wind inlet (101) of vertical direction bending, left end has the horizontal columns ring-type direct current natural gas passage (3) of the direct current gas inlet (103) of vertical direction, left end has horizontal columns ring-type outer eddy flow secondary air channel (12), the burning torch (1) in addition that eddy flow secondary air channel (11) in the horizontal columns ring-type of interior swirl secondary air inlet (104) of vertical direction and left end have the outer swirl secondary air inlet (105) of vertical direction, center wind duct (2), a wind passage (10), direct current natural gas passage (3), the right side in the vertical direction of interior eddy flow secondary air channel (11) and outer eddy flow secondary air channel (12) is mutually concordant.
2. the industrial pulverized coal whirl burning system that natural gas according to claim 1 is combustion-supporting is characterized in that: the right-hand member exit of the right-hand member exit of eddy flow secondary air channel (11) and outer eddy flow secondary air channel (12) is respectively arranged with eddy flow secondary air channel enlarging (9) and outer eddy flow secondary air channel enlarging (16) in the horizontal circle of the same horizontal center line axis frustum ring-type is arranged with it in described.
3. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: described direct current natural gas channel outlet (106) is horizontal circle frustum ring, the left side of this horizontal circle frustum ring is little and the right side is big, also has in the horizontal circle frustum ring in addition from the horizontal circle band of column of its left side level incision.
4. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: described direct current gas inlet (103) is provided with natural gas quick-break valve (4).
5. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: described direct current natural gas channel outlet (106) locates to be provided with spark arrester (7).
6. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: the horizontal Eight characters frustum ring-type Pulverized Coal Concentration device (5) that same horizontal center line axis is arranged with it is set in described wind passage (10), and the left side of this Pulverized Coal Concentration device (5) is little and the right side is big.
7. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: a described wind passage (10) right-hand member exit is provided with circular tooth shape structure smooth combustion apparatus (15), this circular tooth shape structure smooth combustion apparatus (15) is a circulus, and this circulus inwall is along the circumferential evenly distributed circular arc column coal-powder steady flame tooth (19) that has more than three at interval.
8. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2 is characterized in that: be provided with axial adjustable cyclone (6) in the eddy flow secondary air channel (11) in described.
9. the industrial pulverized coal whirl burning system combustion-supporting according to claim 1 or the described natural gas of claim 2, it is characterized in that: described outer swirl secondary air inlet (105) ecto-entad is provided with outer secondary wind accent windshield plate (14) and tangential adjustable cyclone (13) successively.
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Cited By (5)
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| CN102620295A (en) * | 2012-04-13 | 2012-08-01 | 西安康桥能源技术有限责任公司 | Industrial radial concentration dual-air regulation rotational flow coal powder and fuel gas mixed combustor |
| CN103836621A (en) * | 2012-11-21 | 2014-06-04 | 烟台龙源电力技术股份有限公司 | Graded burning low-NOx turbulent burner |
| CN114877314A (en) * | 2022-05-17 | 2022-08-09 | 哈尔滨工业大学 | Rotational flow pulverized coal boiler device and method for coupling combustion of gasified crude synthesis gas and coal |
| CN114963160A (en) * | 2022-05-17 | 2022-08-30 | 哈尔滨工业大学 | FW type W flame boiler device and method for coupling combustion of gasification crude synthesis gas and coal |
| CN115013804A (en) * | 2022-05-17 | 2022-09-06 | 哈尔滨工业大学 | Braway type W flame boiler device and method for gasification coupled combustion |
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Application publication date: 20110706 |