CN213840898U - Counter-flow ignition device under circulating fluidized bed boiler bed - Google Patents
Counter-flow ignition device under circulating fluidized bed boiler bed Download PDFInfo
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- CN213840898U CN213840898U CN202022848163.9U CN202022848163U CN213840898U CN 213840898 U CN213840898 U CN 213840898U CN 202022848163 U CN202022848163 U CN 202022848163U CN 213840898 U CN213840898 U CN 213840898U
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Abstract
The invention relates to a boiler combustion device, in particular to a circulating fluidized bed boiler bed counter-flow ignition device widely used in the ignition and start processes of a circulating fluidized bed boiler in a power station, which mainly comprises a boiler, an ignition air duct and a counter-flow oil gun combined burner, wherein the counter-flow oil gun combined burner comprises a tapered air duct, a supersonic oil-saving environment-friendly oil gun, an ignition gun, a flame stabilizer, an oil gun guide pipe, an inner air duct combined body and a flame jet.
Description
Technical Field
The invention relates to a boiler combustion device, in particular to a circulating fluidized bed boiler under-bed counter-flow ignition device which is widely used in the ignition starting process of various circulating fluidized bed power station boilers of various stages.
Background
The bed air duct ignition device that present thermal power generation circulating fluidized bed boiler adopted in a large number, its common characteristics are that the air duct casing welds for the sheet metal, the air duct inside lining is high temperature refractory material, because weight is too big, whole wind channel is supported by heavy steel gallows, unilateral consideration based on boiler factory technical personnel lets cold and hot wind mix fully, the ratio of whole wind channel design is longer, except causing equipment weight very huge like this, also take up an area of and the construction and the maintenance in initial investment and later stage, and boiler ignition oil consumption in the working costs etc. all increase by a wide margin, for this reason, technological optimization must be carried out.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a more advanced under-bed counter-flow ignition device of a circulating fluidized bed boiler aiming at the technical current situation.
The technical scheme adopted by the invention for solving the technical problems is a circulating fluidized bed boiler under-bed countercurrent ignition device, which comprises a boiler, an ignition air duct, a countercurrent oil gun combined burner and the like; the boiler mainly comprises a hearth, a bed body and an air chamber; the ignition air channel mainly comprises a main air channel body, a combustion-supporting air inlet, a square and round joint and the like; the main air duct is connected with an air chamber of the boiler through a square-round joint; the countercurrent oil gun combined burner comprises a gradually-reduced air duct, a supersonic oil-saving environment-friendly oil gun, an ignition gun and a flame stabilizer-oil gun guide pipe-inner air duct combined body, and the countercurrent oil gun combined burner is fixed at the center of a main air duct close to a square round joint through a mounting bracket, so that the countercurrent ignition device under the circulating fluidized bed boiler bed is formed.
Drawings
FIG. 1 is a main sectional view of the counter-flow igniter under the circulating fluidized bed boiler, and FIG. 2 is an enlarged partial sectional view of the counter-flow oil lance burner assembly.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings:
the structure of the present invention is described as follows:
referring to the attached drawings 1 and 2, the circulating fluidized bed boiler under-bed countercurrent ignition device mainly comprises: a boiler, an ignition air duct and a countercurrent oil gun combined burner; the boiler mainly comprises: a hearth 1, an air chamber 2, a fluidized bed body 3 and bed materials 4; the ignition air duct comprises: a main air duct 5, a square and round joint 13 and combustion-supporting air inlets 11 and 12; the reverse flow oil gun combined burner comprises: a gradually-reduced air duct 7, a supersonic oil-saving environment-friendly oil gun 10, an ignition gun 6, a flame stabilizer-oil gun conduit-inner air duct assembly 8 and a flame jet flow 9.
Wherein the circulating fluidized bed boiler bed lower countercurrent ignition device comprises: the boiler mainly comprises a hearth 1, an air chamber 2 and a fluidized bed body 3; the bed material 4 is dispersed on the fluidized bed body 3.
The circulating fluidized bed boiler under-bed countercurrent ignition device comprises an ignition air channel, wherein the ignition air channel comprises a square and round joint 13, a main air channel 5 and combustion-supporting air inlets 11 and 12.
The inlet of the square round joint 13 is embedded in the main air duct 5;
the outlet of the square and round joint 13 is connected with the wind chamber 2;
the inlet end of the main air duct 5 is connected with combustion-supporting air inlets 11 and 12;
wherein the circulating fluidized bed boiler bed lower countercurrent ignition device comprises: the reverse flow oil gun combined burner comprises: a gradually-reduced air duct 7, a supersonic oil-saving environment-friendly oil gun 10, an ignition gun 6, a flame stabilizer-oil gun conduit-inner air duct assembly 8 and a flame jet flow 9.
Wherein the tapered air duct 7 is arranged at the center of the outlet of the main air duct 5.
Wherein the flame holder-oil gun conduit-inner wind barrel combination 8 is arranged at the center of the air barrel 7 with the gradually reducing opening.
Wherein the supersonic oil-saving environment-friendly oil gun 10 is arranged in the center of the flame holder-oil gun conduit-inner wind barrel combination 8.
Wherein the ignition gun 6 is coaxially arranged at the edge of a flame holder-oil gun conduit-inner wind barrel combination 8.
Thereby forming the counter-flow ignition device under the circulating fluidized bed boiler bed.
The working principle is as follows:
when the boiler is ready for ignition and start-up, combustion-supporting air enters from the combustion-supporting air inlets 11 and 12 of the main air duct 5 and reaches the square round section 13, oil gun flame of the countercurrent oil gun combined burner in the square round section 13 is cooled, the cooled hot air is fed to the bed material 4, the bed material 4 is blown to be fluidized, the bed material is continuously heated to the required temperature, and after ignition is finished, blowing and fluidizing are continuously carried out on the bed material.
The ignition is started, the ignition gun 6 is ignited firstly, the supersonic oil-saving environment-friendly oil gun 10 of the countercurrent oil gun combined burner starts to spray oil and is ignited subsequently, and the fuel flame jet flow 9 is formed rapidly. The supersonic oil-saving environment-friendly oil gun 10 has the characteristics of high flame temperature and very strong flame jet rigidity.
The biggest difference between the direction of the flame jet 9 of the countercurrent ignition device under the circulating fluidized bed boiler bed and the direction of the flame jet of the traditional oil gun is as follows: the jet direction of the flame jet 9 is in a countercurrent mode facing the current direction of combustion-supporting air, the flame jet is sprayed towards the back of the oil gun and is in a backswept mode, and the flame jet is sprayed backwards and is in a countercurrent mode, so that the device is also the largest technical characteristic. Before this, the flame jet direction of all the burners is forward jet and is concurrent. The difference between the countercurrent flow and the cocurrent flow is that, regarding the cross section of the oil gun head as a reference plane, if the combustion-supporting air firstly contacts with the flame 9 of the oil gun and then reaches the reference plane, the countercurrent flow is determined, and otherwise, the cocurrent flow is determined.
The counter-flow ignition device under the circulating fluidized bed boiler bed adopts counter-flow flame, and the main purpose of the counter-flow flame is to shorten the length of the flame and lead the flame to return one section first.
The benefits of this are:
the circulating fluidized bed boiler under-bed countercurrent ignition device adopts countercurrent flame jet flow 9, and is in premature contact with incoming flow of combustion-supporting air, so that direct opposite impact is realized, strong impact is formed, the combustion is more violent, the mixing process is directly enhanced, the more intense the mixing is, the better the temperature reduction effect of flame is, meanwhile, the flame volume can be rapidly reduced, after the flame volume is reduced, the flame can be shortened, the flue gas temperature field entering the air chamber 2 is more uniform, and no open fire enters the air chamber 2, so that a slag falling pipe in the air chamber 2 is prevented from being radiated by the flame and overtemperature, safe slag discharge is ensured, the whole boiler starting process is ensured to be stable and smooth, the boiler ignition from the bed can be changed into ignition from the bed, and the oil consumption can be practically reduced.
The circulating fluidized bed boiler under-bed countercurrent ignition device has the advantages that the outer layer of the countercurrent oil gun combined burner adopts the gradually-reduced air cylinder 7, the effect of the countercurrent oil gun combined burner is to accelerate the incoming flow of combustion-supporting air so as to ensure that high-concentration flame oil flow at the root of an oil gun is timely, high-speed, collided, mixed and supplemented with oxygen, and the countercurrent oil gun under-bed countercurrent ignition device is key equipment for reducing the volume of flame.
When each air channel of the boiler is provided with two oil guns, the circulating fluidized bed boiler under-bed countercurrent ignition device can be directly provided with two countercurrent oil gun combined combustors in a parallel connection mode.
Claims (4)
1. The counter-current ignition device under the circulating fluidized bed boiler bed includes: boiler, ignition wind channel and oil gun combination combustor against current, characterized by the boiler includes: a hearth (1), an air chamber (2), a fluidized bed body (3) and bed materials (4); the ignition air duct comprises: a main air duct (5), a square round joint (13) and combustion-supporting air inlets (11) and (12); the reverse flow oil gun combined burner comprises: a gradually-reduced air duct (7), a supersonic oil-saving environment-friendly oil gun (10), an ignition gun (6), a flame stabilizer-oil gun conduit-inner air duct assembly (8) and a flame jet (9).
2. A circulating fluidized bed boiler underfloor countercurrent ignition device as claimed in claim 1, wherein said gradually reduced vent-tube (7) of the countercurrent oil gun combination burner is disposed at the center of the outlet of the main air duct (5), said flame holder-oil gun duct-inner vent-tube combination (8) is disposed at the center of the gradually reduced vent-tube (7), said supersonic oil-saving and environment-friendly oil gun (10) is disposed at the center of the flame holder-oil gun duct-inner vent-tube combination (8), and said ignition gun (6) is coaxially disposed at the edge of the flame holder-oil gun duct-inner vent-tube combination (8).
3. A circulating fluidized bed boiler underfloor countercurrent ignition device according to claim 1, characterized in that said tapered chimney (7) is of a tapered type.
4. A circulating fluidized bed boiler underfloor countercurrent ignition device according to claim 1, characterized in that the jet direction of said flame jet (9) is swept back, i.e. it is jetted towards the incoming flow direction of the combustion-supporting air, i.e. the tail end of the supersonic oil-saving and environment-friendly oil gun (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022848163.9U CN213840898U (en) | 2020-12-02 | 2020-12-02 | Counter-flow ignition device under circulating fluidized bed boiler bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022848163.9U CN213840898U (en) | 2020-12-02 | 2020-12-02 | Counter-flow ignition device under circulating fluidized bed boiler bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213840898U true CN213840898U (en) | 2021-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022848163.9U Active CN213840898U (en) | 2020-12-02 | 2020-12-02 | Counter-flow ignition device under circulating fluidized bed boiler bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213840898U (en) |
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2020
- 2020-12-02 CN CN202022848163.9U patent/CN213840898U/en active Active
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