CN204554799U - Multi-port pulverized coal preheating burner and the pulverized-coal fired boiler with it - Google Patents
Multi-port pulverized coal preheating burner and the pulverized-coal fired boiler with it Download PDFInfo
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- CN204554799U CN204554799U CN201520215790.5U CN201520215790U CN204554799U CN 204554799 U CN204554799 U CN 204554799U CN 201520215790 U CN201520215790 U CN 201520215790U CN 204554799 U CN204554799 U CN 204554799U
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Abstract
The utility model relates to a kind of multi-port pulverized coal preheating burner, comprising: preheated burning room; Gas-solid separator; And material returning device, the number of described preheated burning room is one, and gas-solid separator is identical with the quantity of material returning device and be at least two, and the gas vent of each gas-solid separator is burner outlet.The utility model also relates to a kind of pulverized-coal fired boiler with above-mentioned multi-port pulverized coal preheating burner.Utilize the technical solution of the utility model, pulverized coal preheating burner nozzle quantity increases, single spout combustion intensity is moderate, boiler wind speed adjustment is simple, fuel and the easier blending of air, and efficiency of combustion is high, fire box temperature is evenly distributed, be conducive to reducing NOx emission, burner and boiler are easy to connect, simplify boiler structure design.
Description
Technical field
The utility model relates to pulverized-coal fired boiler, particularly relates to a kind of pulverized coal preheating burner and a kind of pulverized-coal fired boiler with this burner.
Background technology
The principal mode of coal-burning boiler is pulverized-coal fired boiler, CFBB and grate furnace etc., and coal-powder boiler accounts for more than 90% of boiler total capacity, is the major way of boiler fired coal.Burner is the key equipment of coal-powder boiler, and burner is related to the catching fire of coal dust, combustion stability, efficiency of combustion and pollutant emission characteristic.
In conventional pulverized-coal burner, coal dust all sprays into burner hearth with cold powder form, coal dust sprays into face after burner hearth and catches fire and smooth combustion problem, therefore under low load condition, it is combustion-supporting that pulverized-coal fired boiler often needs to throw oil,, when using the fuel such as anthracite, semicoke of volatile matter lower than 10% in addition, also there is the problems such as difficulty of catching fire, steady combustion characteristic difference and efficiency of combustion are low in low load stable combustion ability.Realize fuel particularly low-volatility fuel varying duty efficient stable burning, be the main difficulty that coal dust efficient burning technology runs into.
Chinese patent CN101158468A discloses a kind of coal fines high-temperature pre-warming method, and coal dust adds from circulating fluidized bed combustor middle and lower part, bottom it, pass into air, by coal dust partial combustion heat release, by pulverized coal preheating to more than 800 DEG C.Pulverized coal preheating is exceeded fuel ignition point to temperature by the method, and high temperature coal dust does not exist problem that is flame-out and flame instability after spraying into burner hearth, is conducive to realizing the coal dust particularly efficient burning of low-volatility fuel and low-load combustion-stabilizing; Meanwhile, because of in pulverized coal preheating process, the nitrogen element portions in coal is separated out and is converted into nitrogen, controls the NOx emission level of coal dust firing preferably.Therefore, according to the pulverized coal preheating burner of the method exploitation, there is good future in engineering applications.But when this pulverized coal preheating burner is used for heavy duty boiler, there is single burner combustion intensity too high, and if join the complexity that multiple burner can increase steam generator system.
Utility model content
In order to make the spout combustion intensity of pulverized coal preheating burner moderate, the utility model is proposed.
According to an aspect of embodiment of the present utility model, propose a kind of multi-port pulverized coal preheating burner, comprising: preheated burning room; Gas-solid separator; And material returning device, the number of described preheated burning room is one, and gas-solid separator is identical with the quantity of material returning device and be at least two, and the gas vent of each gas-solid separator is burner outlet.
Alternatively, the quantity of gas-solid separator and material returning device is two, and two gas-solid separator axial symmetry or be symmetrically arranged in both sides, preheated burning room.
Alternatively, the quantity of gas-solid separator and material returning device is three, and three gas-solid separators are the center of circle with center, preheated burning room, separate 120 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor.
Alternatively, the quantity of gas-solid separator and material returning device is four, and four gas-solid separators are the center of circle with center, preheated burning room, separate 90 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor.
Alternatively, in said burner, preheated burning room is provided with coal dust and adds entrance.Coal dust described in this adds entrance and is suitable for adding the coal dust carried by First air, or is suitable for adding coal dust separately.
Alternatively, in said burner, whole material returning device is equipped with coal dust and adds entrance.Coal dust described in this adds entrance and is suitable for adding the coal dust carried by First air, or is suitable for adding coal dust separately.
According to the another aspect of embodiment of the present utility model, propose a kind of pulverized-coal fired boiler, comprising: burner hearth; And burner, this burner is above-mentioned multi-port pulverized coal preheating burner, and the coal dust of First air and preheating sprays into burner hearth via burner outlet.Alternatively, pulverized coal preheating burner is arranged on burner hearth sidewall.
The pulverized coal preheating burner nozzle quantity that the utility model provides increases, single spout combustion intensity is moderate, boiler wind speed adjustment is simple, fuel and the easier blending of air, efficiency of combustion is high, and fire box temperature is evenly distributed, be conducive to reducing NOx emission, burner and boiler easy to connect, simplify boiler structure design, be specially adapted to Large Copacity pulverized-coal fired boiler.
Accompanying drawing explanation
Fig. 1 is the front elevational schematic of the multi-port pulverized coal preheating burner of an exemplary embodiment of the present utility model.
Fig. 2 is the schematic top plan view of the multi-port pulverized coal preheating burner of an exemplary embodiment of the present utility model.
Fig. 3 is the front elevational schematic of the multi-port pulverized coal preheating burner of another exemplary embodiment of the present utility model.
Fig. 4 is the front elevational schematic of the multi-port pulverized coal preheating burner of another exemplary embodiment of the present utility model.
Fig. 5 is the front elevational schematic of the multi-port pulverized coal preheating burner of Still another example embodiment of the present utility model.
Detailed description of the invention
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.In the description, same or analogous drawing reference numeral indicates same or analogous parts.The explanation of following reference accompanying drawing to the utility model embodiment is intended to make an explanation to overall utility model design of the present utility model, and not should be understood to one restriction of the present utility model.
Pulverized coal preheating burner of the present utility model, comprise connect successively preheated burning room, gas-solid separator and material returning device, the gas vent of gas-solid separator is burner outlet.Wherein, preheated burning room is only one, and gas-solid separator identical with material returning device quantity, be at least two.
The coal addition position of coal dust can have two kinds of selections: one is that the coal dust all arranged from preheated burning room adds entrance and adds, can be with First air carry coal dust formed wind powder mixture form add, also can directly add coal dust with mode such as Impeller powder feeders such as machinery conveyings; Another kind of mode is divided into impartial share, adds from each material returning device, equally, is also can with the adding of form of wind powder mixture or only coal dust.
Be less than the theoretical combustion air of coal dust by controlling the oxygen content of First air, and make to only have the heat release of part coal dust firing and by more than pulverized coal preheating to 800 DEG C, a small amount of high-temperature coal pruinescence gas-solid separator trapping, send preheated burning room back to through material returning device; All the other coal dusts being preheated to high temperature with First air from the gas vent of gas-solid separator, also namely burner outlet sprays into burner hearth.
Thus, provide a set of pulverized coal preheating burner with multiple spout, comprising: preheated burning room; Gas-solid separator; And material returning device, the number of described preheated burning room is one, and gas-solid separator is identical with the quantity of material returning device and be at least two, and the gas vent of each gas-solid separator is burner outlet.
The preheating coal dust amount sprayed for making each spout is even, required by having the arrangement of gas-solid separator.Concrete adoptable structure example is as follows:
As illustrated in fig. 1 and 2, preheated burning room 1 cross section is circular, two gas-solid separators 2 are axisymmetric is arranged in both sides, preheated burning room, namely gas-solid separator entrance is all drawn from top, preheated burning room homonymy and guides contrary both direction into, and the solid material trapped is gone back to preheated burning room 1 from both sides, preheated burning room 1 foldback by the material returning device that two gas-solid separators connect 3.This pulverized coal preheating burner has burner hearth spout, the i.e. burner outlet 21 that two lead to burner hearth.
As shown in Figure 3, preheated burning room 1 cross section is circular, and two gas-solid separators 2 are centrosymmetric is arranged in both sides, preheated burning room, and symmetrical centre is the center of circle of preheated burning room.This pulverized coal preheating burner has burner hearth spout, the i.e. burner outlet 21 that two lead to burner hearth.
As shown in Figure 4, preheated burning room 1 cross section is circular, and three gas-solid separators 2 are the center of circle with center, preheated burning room, separate 120 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor; The returning charge point that material returning device 3 is connected with preheated burning room is also centrosymmetric about preheated burning room central point.This pulverized coal preheating burner has burner hearth spout, the i.e. burner outlet 21 that 3 lead to burner hearth.
As shown in Figure 5, preheated burning room 1 cross section is square, four gas-solid separators 2 are the center of circle with preheated burning room central point, separate 90 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor, namely also four gas-solid separators are drawn from each sidewall of preheated burning room and are centrosymmetricly arranged in its periphery, and symmetrical centre is the central point of its cross section; The returning charge point that material returning device 3 is connected with preheated burning room is also centrosymmetric about preheated burning room central point.This pulverized coal preheating burner has burner hearth spout, the i.e. burner outlet 21 that 4 lead to burner hearth.
Pulverized coal preheating burner of the present utility model can be arranged in burner hearth bottom, also can be arranged in burner hearth sidewall, sprays into the coal dust that is preheated to high temperature and the First air with partial combustion flue gas by burner outlet in burner hearth.
When pulverized coal preheating burner of the present utility model runs, add the coal dust that particle diameter is less than 200 μm to preheated burning room or material returning device, add with coal dust ratio is 0.5 ~ 1.5kg coal dust: 1m simultaneously
3the First air of air, coal dust partial combustion, coal dust is heated to more than 800 DEG C, gas carries high temperature coal dust and flows into each gas-solid separator, the separated device trapping of partial particulate, send preheating chamber back to through material returning device, light the coal dust newly added, the particle of collection at large is from the gas vent of separator, also namely preheating combustion device outlet sprays into burner hearth.
Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and can change these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is by claims and equivalents thereof.
Claims (9)
1. a multi-port pulverized coal preheating burner, comprising:
Preheated burning room;
Gas-solid separator; With
Material returning device,
It is characterized in that:
The number of described preheated burning room is one, and gas-solid separator is identical with the quantity of material returning device and be at least two, and the gas vent of each gas-solid separator is burner outlet.
2. multi-port pulverized coal preheating burner according to claim 1, is characterized in that:
The quantity of gas-solid separator and material returning device is two, and two gas-solid separator axial symmetry or be symmetrically arranged in both sides, preheated burning room.
3. multi-port pulverized coal preheating burner according to claim 1, is characterized in that:
The quantity of gas-solid separator and material returning device is three, and three gas-solid separators are the center of circle with center, preheated burning room, separate 120 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor.
4. multi-port pulverized coal preheating burner according to claim 1, is characterized in that:
The quantity of gas-solid separator and material returning device is four, and four gas-solid separators are the center of circle with center, preheated burning room, separate 90 ° successively and be arranged on the concentric circles that encloses preheated burning outdoor.
5. the multi-port pulverized coal preheating burner according to any one of claim 1-4, is characterized in that:
Preheated burning room is provided with coal dust and adds entrance.
6. multi-port pulverized coal preheating burner according to claim 5, is characterized in that:
Described coal dust adds entrance and is suitable for adding the coal dust carried by First air, or is suitable for adding coal dust separately.
7. the multi-port pulverized coal preheating burner according to any one of claim 1-4, is characterized in that:
Whole material returning device is equipped with coal dust and adds entrance.
8. multi-port pulverized coal preheating burner according to claim 7, is characterized in that:
Described coal dust adds entrance and is suitable for adding the coal dust carried by First air, or is suitable for adding coal dust separately.
9. a pulverized-coal fired boiler, comprising:
Burner hearth; With
Burner,
It is characterized in that:
Described burner is the multi-port pulverized coal preheating burner according to any one of claim 1-8, and the coal dust of First air and preheating sprays into burner hearth via burner outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520215790.5U CN204554799U (en) | 2015-04-10 | 2015-04-10 | Multi-port pulverized coal preheating burner and the pulverized-coal fired boiler with it |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520215790.5U CN204554799U (en) | 2015-04-10 | 2015-04-10 | Multi-port pulverized coal preheating burner and the pulverized-coal fired boiler with it |
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| CN204554799U true CN204554799U (en) | 2015-08-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780095A (en) * | 2020-06-24 | 2020-10-16 | 中国科学院工程热物理研究所 | Combustion system, control method thereof and preheating equipment |
| CN112833415A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院工程热物理研究所 | Pulverized coal preheating device and pulverized coal combustion system with same |
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2015
- 2015-04-10 CN CN201520215790.5U patent/CN204554799U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833415A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院工程热物理研究所 | Pulverized coal preheating device and pulverized coal combustion system with same |
| CN111780095A (en) * | 2020-06-24 | 2020-10-16 | 中国科学院工程热物理研究所 | Combustion system, control method thereof and preheating equipment |
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