CN201106846Y - Plasma ignition combustion apparatus - Google Patents
Plasma ignition combustion apparatus Download PDFInfo
- Publication number
- CN201106846Y CN201106846Y CNU2007200431510U CN200720043151U CN201106846Y CN 201106846 Y CN201106846 Y CN 201106846Y CN U2007200431510 U CNU2007200431510 U CN U2007200431510U CN 200720043151 U CN200720043151 U CN 200720043151U CN 201106846 Y CN201106846 Y CN 201106846Y
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- drum
- plasma
- tube
- air
- burning
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Abstract
The utility model discloses a plasma ignition burning device, which relates to a technology field of using high energy plasma jetting current to heat up and burn the air and pulverized coal mixture, in particular to a plasma ignition burning device used in power station. The utility model includes a central burning drum; the lateral wall of the central burning drum is connected with a plasma generator; one end of the central burning drum is closed, and the lateral of the central burning drum corresponding to the plasma generator is connected with an air inlet drum. By adopting the structure, the current of the air and pulverized coal enters the central burning drum from the inlet drum and burns under the high energy plasma jetting current. And the multidirectional rotation air streams and circumfluence are formed in the drum, which changes the unity of inlet air motion in axial direction, reduces the axial speed, increases the retention time of coal powder current in the drum, and makes a beneficial environment for igniting the coal powder and separating out the volatile component. The coal powder is fully burnt, and the rate of ignition and burning is stable; the structure is simple.
Description
Technical field
The utility model relates to the technical field of utilizing the heating of high energy plasma jet to make the wind powder mixture burning, particularly the plasma ignition combustion device that uses in the power station.
Background technology
The thermoelectricity industry is China's important energy industry, also is the oil consumption industry simultaneously, and need expend a large amount of fuel oils every year aspect boiler combustion.Present employed Plasma Firing Technology, it is the mode that adopts replace oil with coal, obtain the plasma of extreme temperatures by ionized air, utilize directly firing coal-dust of high energy plasma jet heating wind powder mixture, realized being issued to the purpose of igniting in situation without any need for fuel oil, fuel oil has been saved in burning when can be used for preceding preheating of power plant boiler startup and low power consumption greatly, has certain economic benefits.
The plasma ignition combustion device, electric arc and the highly organized aerodynamic field of plasma flame that can launch by plasma generator are to guarantee the plasma key equipment of firing coal-dust in time.Present employed ignition device is to send into the plasma torch center along the burner axial direction through the coal dust that concentrates, coal dust is at first lighted in central tube, and form the incendiary source of secondary coal dust in the exit of central tube, and and amplify step by step, spray into burner hearth and make and form flame in the stove.Yet when reality is used, often cause unstable combustion because of ature of coal or other reasons, in addition occur can not successful firing coal-dust phenomenon, when especially lighting low-volatite coal or soft coal, sometimes it is combustion-supporting to need to utilize oil gun to carry out, thereby has lost the meaning of using plasma ignition.Heat during in addition owing to coal dust firing makes volume of air expand rapidly, be subjected to the restriction in space in the ignition device, rise the self-ignition position, wind speed in the combustion chamber is that axial velocity becomes multiple to improve, axial velocity is consistent with the flame spread velocity attitude, even causes the speed of flame spread to make unstable combustion less than the flowing velocity of breeze airflow, and pulverized coal particle time of staying in central tube is too short simultaneously, can not burn fully, cause the waste of raw material.Same because stable combustion problem, boiler maker requires oil gun that boiler load is reached 15%BMCR (boiler maximum continuous rating) usually and just allows to drop into the plasma ignition combustion device when above, limit the scope of application of plasma ignition combustion device, can not reach best oil-saving effect.In addition, because plasma igniter does not also form good steady combustion environment at present, in the whole process of boiler startup, igniter needs operation continuously, thereby shortened the life-span of plasma electrode, plasma electrode need regularly replace, and is to cause Plasma Firing Technology cost height, the limited main cause of popularization.
When the thermal ionization air of plasma emission can only reach the position of center line of burner, it is less that flame forms scope, only be the wall place near ignition zone, and the fire area is all after ignition location.The air current flow direction is axially-movable, and behind the coal powder ignition, the limited axial velocity several times that make of flow expansion increase, even surpasses flame propagation velocity.When firing temperature was 2000K, it is lower that coal dust is lighted rate, when firing temperature is 1600K, coal dust just can not fire burns.
The utility model content
The utility model purpose provide a kind of coal dust firing fully, stable, the simple in structure plasma ignition combustion device of steady combustion probability catches fire.
The utility model comprises the central burner tube, connects plasma generator on the sidewall of described central burner tube, and the end sealing of central burner tube connects the air intake tube on the sidewall of the central burner tube relative with connecting plasma generator.
The utility model adopts the said structure form, wind powder air-flow enters the central burner tube from the air intake tube, under the effect of high energy plasma jet, carrying out fire burns, in tube, form multi-direction swirling eddy and backflow, changed the unicity of the air motion of air inlet through hollow shaft, thereby reduced axial velocity, increased the time of staying of breeze airflow in tube, for coal dust catch fire and volatile matter separate out the condition created.Make coal dust firing complete, the steady combustion probability that catches fire is stable, simple in structure.
Angle between the center line of the center line of air intake tube of the present utility model and central burner tube is 45 °～90 °.Radially vertical or tangential vertical between air intake tube and the central burner tube.Wind powder air-flow can be along the direction or oblique the sending in the burner of vertical centre combustion barrel, make wind powder air-flow that axial velocity not only be arranged in burner, and also have radially and tangential velocity, in the central burner tube, form multi-direction swirling eddy and backflow, increase the time of staying of breeze airflow in the central burner tube, promoted coal dust completing combustion.
The end that the utility model central burner tube is closed is outstanding laterally, and the cross section of ledge is trapezoidal.Breeze airflow has had bigger combustion space in the central burner tube like this, can be fully and completing combustion.
The utility model adopts the said structure form to have following advantage:
(1) wind powder air-flow radially or is tangentially sent in the burner, make wind powder air-flow that axial velocity not only be arranged in burner, and also have radially and tangential velocity, in tube, form multi-direction swirling eddy and backflow, changed the unicity of the air motion of air inlet through hollow shaft, thereby reduced axial velocity, increased the time of staying of breeze airflow in tube, for coal dust catch fire and volatile matter separate out the condition created.
(2) owing to formed eddy flow and backflow in tube, make the fire area enlarge, the flame degree of filling is good, when the thermal ionization air of plasma emission can only reach the position of center line of burner, still can make flame spread arrive cross section in the whole tube.
(3) pulverized coal particle makes that along with the air-flow swirling recirculation flow wall place coal powder density of close ignition location is higher, helps the igniting of plasma.
(4) pulverized coal particle shuttling movement in the recirculating zone has the long time of staying, has time enough to make volatile matter separate out, and reaches ignition temperature.
(5) catch fire at the ignition zone coal powder cyclone, flame is rotation thereupon also, and the coal dust after catching fire can be used as follow-up thermal source, outwards propagates.
(6) at ignition location, both sides all can be lighted coal dust vertically, form two-sided ignition zone, and ignition zone only forms flame by traditional behind ignition location, all can form the double-sided ignition of flame before and after becoming.
(7) the firing temperature accommodation of the flame that produces for plasma generator is bigger, but still stable operation when the flame temperature that generator produces has only 1600K, and plasma resistant and external interference ability are strong.
(8) flexible design, blast pipe and burner diameter can change according to coal, ignition device difference, and the primary air velocity adjustable range is bigger.
(9) simple in structure, it is convenient to implement.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is an another kind of structural representation of the present utility model.
Fig. 3 is the structural representation of the utility model central burner tube and air intake tube connection status.
Fig. 4 is the schematic diagram of two air intake tubes.
Fig. 5 is the schematic diagram of single air intake tube.
The specific embodiment
As shown in Figure 1, a side of central burner tube 1 connects plasma generator 4, and the right part sealing of central burner tube 1 connects air intake tube 5 on the sidewall of the central burner tube 1 relative with connecting plasma generator 4.
Angle between the center line of the center line of air intake tube 5 and central burner tube 1 is 45 °～90 °.Radially vertical between air intake tube 5 and the central burner tube 1.Tangential vertical between air intake tube 5 and the central burner tube 1.The right part of blocked center combustion barrel 1 is outwards outstanding, and it is trapezoidal that the cross section is.
The utility model in use, when firing temperature is in greater than the zone more than the 1000K, flame can be full of in the whole central burner tube 1.Near the flame of plasma generation is lighted rapidly coal dust, the flame that forms moves with eddy flow wind, be full of whole central burner tube 1, because what air-flow formed is rotation tangential velocity field, so it is very little to the influence of its axial velocity that coal powder ignition expands, and makes that the time of staying of coal dust is longer, has sufficient ignition time and flame propagation time, in tube, form rotary flame, coal powder ignition rate height.In addition, in the right part of central burner tube 1 projection that is trapezoidal shape is arranged, make all can form backflow and eddy flow in the both sides, front and back of ignition location, pulverized coal particle is all managed to make do fire burns in the both sides of ignition location like this.
In Fig. 2, the left end of central burner tube 1 and an air duct 2 are rotationally connected, central burner tube 1 and air duct 2 are arranged in airduct 3, central burner tube 1 is connected plasma generator 4 with the correspondence position of airduct 3 one sides, central burner tube 1 is connected air intake tube 5 with the opposite side of an airduct 3, also can realize above-mentioned purpose.As can be seen from Figure 4 and Figure 5, according to different needs, air intake tube 5 can adopt single tube and two-tube two kinds of structures.Among Fig. 4, radially vertical between air intake tube 5 and the central burner tube 1, among Fig. 5, tangential vertical between air intake tube 5 and the central burner tube 1.
Claims (5)
1. plasma ignition combustion device, comprise central burner tube (1), connect plasma generator (4) on the sidewall of described central burner tube (1), it is characterized in that the end sealing of central burner tube (1), connect air intake tube (5) on the sidewall of the central burner tube (1) relative with connecting plasma generator (4).
2. plasma ignition combustion device according to claim 1 is characterized in that the angle between the center line of the center line of air intake tube (5) and central burner tube (1) is 45 °～90 °.
3. plasma ignition combustion device according to claim 2 is characterized in that between described air intake tube (5) and the central burner tube (1) radially vertical.
4. plasma ignition combustion device according to claim 2 is characterized in that between described air intake tube (5) and the central burner tube (1) tangential vertical.
5. plasma ignition combustion device according to claim 1 is characterized in that the blind end of central burner tube (1) is outstanding laterally, and the cross section of ledge is trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200431510U CN201106846Y (en) | 2007-08-14 | 2007-08-14 | Plasma ignition combustion apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200431510U CN201106846Y (en) | 2007-08-14 | 2007-08-14 | Plasma ignition combustion apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201106846Y true CN201106846Y (en) | 2008-08-27 |
Family
ID=39958653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200431510U Expired - Fee Related CN201106846Y (en) | 2007-08-14 | 2007-08-14 | Plasma ignition combustion apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201106846Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246607A (en) * | 2017-07-06 | 2017-10-13 | 山西大学 | A kind of automatic stable burning system for Process In A Tangential Firing |
-
2007
- 2007-08-14 CN CNU2007200431510U patent/CN201106846Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246607A (en) * | 2017-07-06 | 2017-10-13 | 山西大学 | A kind of automatic stable burning system for Process In A Tangential Firing |
| CN107246607B (en) * | 2017-07-06 | 2023-05-30 | 山西大学 | Automatic stable combustion system for four-corner tangential boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080827 Termination date: 20110814 |