CN204717670U - A kind of 300MW generating set boiler staged combustion systems - Google Patents
A kind of 300MW generating set boiler staged combustion systems Download PDFInfo
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- CN204717670U CN204717670U CN201520207585.4U CN201520207585U CN204717670U CN 204717670 U CN204717670 U CN 204717670U CN 201520207585 U CN201520207585 U CN 201520207585U CN 204717670 U CN204717670 U CN 204717670U
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Abstract
The utility model discloses a kind of 300MW generating set boiler staged combustion systems, on the basis of 300MW generating set boiler staged combustion systems, while Fuel-air fractional combustion, and utilize the low-calorie characteristic of blast furnace gas, flame kernel temperature is reduced, reduce the growing amount of flame kernel thermal NO, and by secondary firing district (reducing zone), the nitrogen oxide generated is reduced, make a small amount of nitrogen oxide discharge burner hearth and enter SCR process, save the consumption of liquefied ammonia; Simultaneously due to the reduction of flame kernel temperature and the supply of three grades of a large amount of burnout degree in combustion zone, flue gas temperature of hearth outlet is reduced, and superheater, the reheater desuperheating water consumption of boiler significantly reduce, and exhaust gas temperature reduces, and improves boiler efficiency.
Description
Technical field
The utility model relates to thermal power generation field of combustion technology, particularly relates to a kind of 300MW generating set boiler staged combustion systems.
Background technology
In recent years, China's nitrogen oxide emission constantly increases, Acid Rain Pollution by sulfuric acid type to sulfuric acid, the compound transformation of nitric acid, city atmospheric environment situation is still severe, and regional atmosphere polluting problem becomes clear day by day.In addition, emission control requirement gap compared with developed countries and regions of nitrogen oxide is larger.Therefore, be control the nitrogen oxides pollution thing emission level of coal fired thermal power plant, discharged nitrous oxides concentration is decided to be the standard of 100mg/Nm3 by China, and defines the time limit of observing concentration of emission restriction that existing thermal power plant must be stricter.
And now, the boiler combustion condition in thermal power plant is undesirable, make the amount of nitrogen oxides after burning high, desuperheating water consumption of simultaneously burning is large, and flue gas loss is large, and boiler efficiency is low.If only carry out the improvement of nitrogen oxide after stove, not only increase equipment investment and operation and maintenance cost, and employ SCR (Selective Catalytic Reduction owing to administering after stove, SCR technology) process, consumption liquefied ammonia that also can be too much and then cause the problems such as the blocking of the heated surface at the end of boiler such as preheater to occur.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of 300MW generating set boiler staged combustion systems, undesirable to solve existing boiler combustion condition, causes the technical problem that the amount of nitrogen oxides after burning is high.
For solving the problems of the technologies described above, the utility model provides a kind of 300MW generating set boiler staged combustion systems, comprising: boiler furnace 1, bellow assemblies 2, coal gas system 3, four limits of described boiler furnace 1 are respectively arranged with every angle burner 4, described bellow assemblies 2 and described coal gas system 3 provide air and fuel to burn by the nozzle of described every angle burner 4 to described boiler furnace 1, described boiler furnace 1, on longitudinal space, is provided with single-stage combustion district, secondary firing district, three grades of combustion zones, described single-stage combustion district is on longitudinal space from top to bottom, the nozzle arranged has: A floor height gas jets 101, GA floor height gas jets 102, B floor height gas jets 103, bottom overfire air jet 104, coal dust A layer nozzle 105, AB coke charge gas jets 106, coal dust B layer nozzle 107, BC coke charge gas jets 108, coal dust C layer nozzle 109, overfire air jet 1010, wherein, described A floor height gas jets 101, described GA floor height gas jets 102, described B floor height gas jets 103, described coal dust A layer nozzle 105, described AB coke charge gas jets 106, described coal dust B layer nozzle 107, described BC coke charge gas jets 108, described coal dust C layer nozzle 109 is input to the 80%-85% that the fuel burnt described first combustion zone accounts for total fuel quantity altogether, described bottom overfire air jet 104, the excess air coefficient α 1>1 that described overfire air jet 1010 provides, described secondary firing district is on longitudinal space from top to bottom, the nozzle arranged has: nozzle 1011 under lower burnout degree, lower burnout degree top nozzle 1012, overfire air jet 1013, coal dust D layer nozzle 1014, DE coke charge gas jets 1015, wherein, described coal dust D layer nozzle 1014, described DE coke charge gas jets 1015 is input to the 15%-20% that the fuel burnt described second combustion zone accounts for total fuel quantity altogether, nozzle 1011 under described lower burnout degree, described lower burnout degree top nozzle 1012, the excess air coefficient α 2<1 that described overfire air jet 1013 provides, described three grades of combustion zones, on longitudinal space from top to bottom, the nozzle of setting has: coal dust E layer nozzle 1016, top overfire air jet 1017, nozzle 1018 under upper burnout degree, upper burnout degree top nozzle 1019, wherein, described coal dust E layer nozzle 1016 does not provide fuel, described top overfire air jet 1017, nozzle 1018 under described upper burnout degree, the excess air coefficient α 3>1 that described upper burnout degree top nozzle 1019 provides.
Preferably, described bellow assemblies 2 at least comprises the first bellows; Described first bellows connect every angle burner on the adjacent both sides of described boiler furnace; Described first bellows become at least one air compartment by baffle for separating, and at least one air compartment described connects the nozzle of every angle burner 4 on the adjacent both sides of described boiler furnace.
Preferably, the top plenum that described first bellows are corresponding can swing in the interval of [-10 ° ,+10 °] in the horizontal direction.
Preferably, described coal dust A layer nozzle 105, described AB coke charge gas jets 106, described coal dust B layer nozzle 107, described BC coke charge gas jets 108, described coal dust C layer nozzle 109, described coal dust D layer nozzle 1014, described DE coke charge gas jets 1015, described coal dust E layer nozzle 1016 all can swing up and down 20 ° in the vertical; Described bottom overfire air jet 104, described overfire air jet 1010, described overfire air jet 1013, described top overfire air jet 1017 all can swing up and down 30 ° in the vertical.
Preferably, described coal dust A layer nozzle 105, described coal dust B layer nozzle 107, described coal dust C layer nozzle 109, described coal dust D layer nozzle 1014, is all provided with shutter and waveform bluff body in the spout of described coal dust E layer nozzle 1016; The coal dust entering nozzle can be shunted by described shutter, the dense phase pulverized coal air-flow of formation and light phase breeze airflow; Described waveform bluff body can make described dense phase pulverized coal air-flow and described light phase breeze airflow have stable recirculating zone in described waveform bluff body exit, so that dense phase pulverized coal air-flow and the burning of light phase breeze airflow.
Preferably, the fuel that described single-stage combustion district uses is specially: coal, high gas, burnt gas.
Preferably, the fuel that described secondary firing district uses is specially: coal, burnt gas.
The beneficial effect of the 300MW generating set boiler staged combustion systems that the utility model provides is as follows:
On the basis of 300MW generating set boiler staged combustion systems, while Fuel-air fractional combustion, and utilize the low-calorie characteristic of blast furnace gas, flame kernel temperature is reduced, reduce the growing amount of flame kernel thermal NO, and by secondary firing district (reducing zone), the nitrogen oxide generated is reduced, make a small amount of nitrogen oxide discharge burner hearth and enter SCR process, save the consumption of liquefied ammonia; Simultaneously due to the reduction of flame kernel temperature and the supply of three grades of a large amount of burnout degree in combustion zone, flue gas temperature of hearth outlet is reduced, and superheater, the reheater desuperheating water consumption of boiler significantly reduce, and exhaust gas temperature reduces, and improves boiler efficiency.
Accompanying drawing explanation
The structure chart of the 300MW generating set boiler staged combustion systems that Fig. 1 provides for the utility model embodiment;
The structure chart of every angle burner that Fig. 2 provides for the utility model embodiment;
The structural representation of the coal gas system that Fig. 3 provides for the utility model embodiment;
Fig. 4 is the cut-away view that the utility model embodiment provides boiler furnace;
The internal structure schematic diagram of the coal dust A layer nozzle that Fig. 5 provides for the utility model embodiment.
Detailed description of the invention
In order to make the utility model the technical staff in the technical field more clearly understand the utility model, below in conjunction with accompanying drawing, by specific embodiment, technical solutions of the utility model are described in detail.
Emphasis of the present utility model is on the architecture basics of 300MW generating set boiler staged combustion systems, by adopting fuel and air three classification technique, to the jet tissue of primary and secondary air in stove, on the longitudinal space yardstick of burner hearth, burning is divided into single-stage combustion district (oxidizing fire district), secondary firing district (reducing zone) and three grades of combustion zones (burning-out zone).The fuel of 80-85% is sent into first-stage burning district by nozzle, under excess air coefficient α 1>1 condition, burns and generate nitrogen oxide.The fuel of all the other 15-20% then sends into secondary firing district by nozzle, under the condition of excess air coefficient α 2<1, form very strong reducing atmosphere, make the nitrogen oxide generated in single-stage combustion district be reduced into nitrogen molecular in secondary firing district.In secondary combustion district, not only make the nitrogen oxide generated be reduced, further suppress the generation of new nitrogen oxide, the concentration of emission of nitrogen oxide can be made to reduce further.Nozzle air feed is arranged on secondary combustion district, form third level combustion zone (burning-out zone), to ensure that the after-flame of the imperfect combustion product generated in secondary combustion district forms reduction of nitrogen oxide district in secondary firing district, nitrogen oxide is reduced as far as possible in stove, finally reaches the object reducing former flue gas nitrogen oxide.
First the overall structure of 300MW generating set boiler staged combustion systems is introduced below.
Referring to Fig. 1, is the structure chart of the 300MW generating set boiler staged combustion systems that the utility model embodiment provides.
Wherein, this system mainly comprises: boiler furnace 1; Bellow assemblies 2; Coal gas system 3; In addition, four limits of boiler furnace 1 are respectively arranged with every angle burner 4, and every angle burner 4 has 19 nozzles.In these 19 nozzles, comprise 4, burnout degree nozzle, 4, coke-stove gas nozzle, coal nozzle 5,2, blast furnace gas nozzle, overfire air jet 4.
The structure of every angle burner 4 is as Fig. 2.On genesis analysis, be followed successively by from top to bottom:
A floor height gas jets 101, GA floor height gas jets 102, B floor height gas jets 103, bottom overfire air jet 104, coal dust A layer nozzle 105, AB coke charge gas jets 106, coal dust B layer nozzle 107, BC coke charge gas jets 108, coal dust C layer nozzle 109, overfire air jet 1010.Nozzle 1011 under lower burnout degree, lower burnout degree top nozzle 1012, overfire air jet 1013, coal dust D layer nozzle 1014, DE coke charge gas jets 1015.Coal dust E layer nozzle 1016, top overfire air jet 1017, nozzle 1018 under upper burnout degree, upper burnout degree top nozzle 1019.
Bellow assemblies 2 and coal gas system 3 provide air and fuel to burn by 19 nozzles of every angle burner 4 to boiler furnace 1.
Concrete, bellow assemblies 2 at least comprises the first bellows; First bellows connect every angle burner 4 on the adjacent both sides of boiler furnace 1;
First bellows become at least one air compartment by baffle for separating, and at least one air compartment connects the nozzle of every angle burner 4 on the adjacent both sides of boiler furnace 1.
Preferably, top plenum corresponding to the first bellows can swing, so that provide air to make full combustion of fuel in the interval of [-10 ° ,+10 °] in the horizontal direction.
In actual applications, bellow assemblies 2 also comprises the second bellows, and the second bellows are connected boiler furnace 1 with the first bellows symmetry.Second bellows and the first bellows similar, have employed traditional large bellows structure, become at least one air compartment by baffle for separating, at least one air compartment connects the nozzle of every angle burner 4 on the adjacent both sides of boiler furnace 1.
For coal gas system 3, coal gas system 3 is also be connected with every angle burner 4 on four limits of boiler furnace 1, and provides fuel by every angle burner 4 pairs of boiler furnaces 1.
Please refer to Fig. 3 below, is the structural representation of coal gas system 3.
The gas pipings such as high gas (i.e. blast furnace gas), burnt gas (that is: coke-stove gas), through pneumatic operated valve 001, motor-driven valve 002, is assigned to valve 004 after expansion joint 003, and is delivered in every angle burner 4 on boiler furnace 1 four limit by valve 004.
Composition graphs 1, Fig. 2 and Fig. 3, please refer to Fig. 4 below, and Fig. 4 is the cut-away view of boiler furnace 1.
In the utility model, be only that arranging of other limits is similar, repeats no more using the every angle burner arranged of boiler furnace as introduction.
Boiler furnace 1, on longitudinal space, is provided with single-stage combustion district, secondary firing district, three grades of combustion zones.
Single-stage combustion district is provided with altogether 10 nozzles.On longitudinal space from top to bottom, the nozzle arranged has: A floor height gas jets 101, GA floor height gas jets 102, B floor height gas jets 103, bottom overfire air jet 104, coal dust A layer nozzle 105, AB coke charge gas jets 106, coal dust B layer nozzle 107, BC coke charge gas jets 108, coal dust C layer nozzle 109, overfire air jet 1010.
Wherein, A floor height gas jets 101, GA floor height gas jets 102, B floor height gas jets 103, coal dust A layer nozzle 105, AB coke charge gas jets 106, coal dust B layer nozzle 107, BC coke charge gas jets 108, coal dust C layer nozzle 109 is input to the 80%-85% that the fuel burnt the first combustion zone accounts for total fuel quantity altogether, bottom overfire air jet 104, the excess air coefficient α 1>1 that overfire air jet 1010 provides;
The nozzle that secondary firing district is arranged altogether has 5.Wherein, on longitudinal space from top to bottom, the nozzle of setting has: nozzle 1011 under lower burnout degree, lower burnout degree top nozzle 1012, overfire air jet 1013, coal dust D layer nozzle 1014, DE coke charge gas jets 1015.
Wherein, coal dust D layer nozzle 1014, DE coke charge gas jets 1015 is input to the 15%-20% that the fuel burnt the second combustion zone accounts for total fuel quantity altogether, nozzle 1011 under lower burnout degree, lower burnout degree top nozzle 1012, the excess air coefficient α 2<1 that overfire air jet 1013 provides;
Three grades of combustion zones, are provided with 4 nozzles altogether.On longitudinal space from top to bottom, the nozzle of setting has: coal dust E layer nozzle 1016, top overfire air jet 1017, nozzle 1018 under upper burnout degree, upper burnout degree top nozzle 1019.
Wherein, coal dust E layer nozzle 1016 does not provide fuel; Top overfire air jet 1017, nozzle 1018 under upper burnout degree, the excess air coefficient α 3>1 that upper burnout degree top nozzle 1019 provides.
Further, in order to carry out Thorough combustion to fuel, also specially treated is done to some nozzle, specific as follows:
Coal dust A layer nozzle 105, AB coke charge gas jets 106, coal dust B layer nozzle 107, BC coke charge gas jets 108, coal dust C layer nozzle 109, coal dust D layer nozzle 1014, DE coke charge gas jets 1015, coal dust E layer nozzle 1016 all can swing up and down 20 ° in the vertical;
Bottom overfire air jet 104, overfire air jet 1010, overfire air jet 1013, top overfire air jet 1017 all can swing up and down 30 ° in the vertical.
Further, for coal nozzle, in the spout of coal dust A layer nozzle 105, coal dust B layer nozzle 107, coal dust C layer nozzle 109, coal dust D layer nozzle 1014, coal dust E layer nozzle 1016, be all provided with shutter and waveform bluff body;
Please refer to Fig. 5 below, is the internal structure schematic diagram of coal dust A layer nozzle, and other coal dust layer nozzles are similar.
The nozzle of coal dust A layer is specifically used for Coal powder spray, and coal dust carries by the Main Function of First air exactly to be sent in boiler furnace 1.
The coal dust entering nozzle can be shunted by shutter 0001, the dense phase pulverized coal air-flow of formation and light phase breeze airflow;
Waveform bluff body can make dense phase pulverized coal air-flow and light phase breeze airflow have stable recirculating zone in waveform bluff body exit, so that dense phase pulverized coal air-flow and the burning of light phase breeze airflow.
Preferably, the fuel that the utility model uses in single-stage combustion district is specially: coal, high gas, burnt gas.The fuel used in secondary firing district is specially: coal, burnt gas.
Below incorporated by reference to Fig. 3, specifically introduce the operation principle of the 300MW generating set boiler staged combustion systems that the utility model provides.
300MW generating set boiler staged combustion systems, adopt fuel and air three classification technique, on the longitudinal space yardstick of burner hearth, burning is divided into single-stage combustion district (oxidizing fire district), secondary firing district (reducing zone) and three grades of combustion zones (burning-out zone).
Wherein, single-stage combustion district distributes primary fuel (coal, blast furnace gas, part coke-stove gas, total proportion accounts for the 80%-85% of whole fuel), supply excess air coefficient α 1 > 1, this region mainly produces the gas of the compositions such as NO, CO, H2O, ash, SO2 simultaneously.
Secondary firing district distributes secondary fuel (a small amount of coal and a small amount of coke-stove gas, total proportion accounts for the 15%-20% of whole fuel), supply excess air coefficient α 2 < 1, this region mainly generates the gas of the composition such as N2, XN (X represents certain element), XH simultaneously.
Three grades of combustion zones are by a large amount of dispensing burnout degree, and excess air coefficient α 3 > 1, ensure the Thorough combustion of fuel, this region mainly produces the gas of the compositions such as NO, N2.
Concrete, when dropping into fuel combustion in single-stage combustion district:
Choose total proportion and account for the coal, blast furnace gas, part coke-stove gas etc. of 80%-85% as one-level fuel.In the process dropping into fuel, by the multiple nozzles in single-stage combustion district, drop into A layer coal dust, B layer coal dust, simultaneously by A floor height gas, B high gas layer by layer, GA coke charge gas, AB coke charge gas, BC coke charge gas etc. are all dropped in the concentrated combustion of first-stage burning district.The fineness of A layer coal dust, B layer coal dust is pressed R90=20 and is controlled, and on air distribution controls, corresponding Secondary Air air distribution is opened to 50%, burns under the condition of excess air coefficient α 1 > 1.
When dropping into fuel combustion in secondary firing district:
Choose the fuel of the higher and inflammable coke-stove gas of calorific value as secondary firing district, but the ratio required for fuel is 15%-20% (heat), and coke-stove gas does not reach the heat of 15%-20% in the heat proportioning in secondary firing region.Therefore, on this basis, also need to drop into D layer coal dust.
As the coal dust of secondary fuel, in the control of fineness, D layer fineness of pulverized coal controls at R90=15, and fine breeze is easier to fugitive constituent is decomposed, produce and have more vapour to produce reduction as reducing gas to the NOx generated and intermediate product, the growing amount of NOx is reduced.
In the control of air distribution, secondary air damper aperture corresponding for secondary firing district is opened to 30%, keep excess air coefficient α 2 < 1.
When three grades of combustion zone burnings:
Drop on upper burnout degree, under upper burnout degree, keep burnout degree aperture 40%, the oxygen content of adjustment furnace outlet at 3.5-4.0%, to ensure the after-flame of combustible.Also need top Secondary Air to drop in addition, ensureing, on the basis that former flue gas is low-nitrogen discharged, to reduce flying dust as much as possible.
And for the jet velocity of Secondary Air, to the burning of burner hearth inscribed circle, play the effect that disturbance is strengthened, make air and fuel mix abundant, make burning more fully, thorough.So the reinforcement of secondary air stiffness, plays very important effect to the combustion zone of three in burner hearth.When high, burnt gas consumption is stable, the burner do not come into operation, suitably opens the surrounding air of 5%-10%, for cooling; The burner used, does not open surrounding air; The burning zone of the Secondary Air do not come into operation, only suitably need opening 5% for cooling, by taking above measure, the pressure of secondary air bellow being increased to 0.6kPa, the Secondary Air greatly strengthened spray into speed.
Distribution for combustion zone heat:
At coal gas fuel mixing ratio (coal gas fuel mixing ratio, in the fuel dropped under certain load operating mode exactly, mainly coal gas (high, coke-stove gas) and coal dust, in fuel heat ratio) about 35% when, that is: coal gas heat accounts for 35% (blast furnace gas 20% of total fuel, coke-stove gas 15%), coal dust accounts for 65% of total fuel heat.According to the principle (single-stage combustion district fuel/secondary firing district fuel=8:2) of fuel staging, A, B mill is as the main fuel in single-stage combustion district, D mill as secondary firing district supplement, by A, B, D tri-grind exert oneself arrange biased, by the pattern of A=B > D.In combustion, coal dust is dropped into mainly by A, B, D tri-mill, additional coal gas.Wherein A mill, B grind single-stage combustion district, and D mill belongs to secondary firing district.A mill, B mill are as single-stage combustion district, and D mill is secondary firing district.Wherein, A mill, B mill are exerted oneself equal in single-stage combustion district, i.e. A=B.And secondary firing district main fuel is coke-stove gas, in order to ensure that two-stage combustion district is by 8:2 pro rate, D mill supplements as the auxiliary of secondary firing district, and it is exerted oneself and will grind lower than A, B, i.e. A > D, and B > D.In addition, every layer of each nozzle that high gas, burnt gas use takes the mode of mean allocation fuel.
The beneficial effect of the 300MW generating set boiler staged combustion systems that the utility model provides is as follows:
On the basis of 300MW generating set boiler staged combustion systems, while Fuel-air fractional combustion, and utilize the low-calorie characteristic of blast furnace gas, flame kernel temperature is reduced, reduce the growing amount of flame kernel thermal NO, and by secondary firing district (reducing zone), the nitrogen oxide generated is reduced, make a small amount of nitrogen oxide discharge burner hearth and enter SCR process, save the consumption of liquefied ammonia; Simultaneously due to the reduction of flame kernel temperature and the supply of three grades of a large amount of burnout degree in combustion zone, flue gas temperature of hearth outlet is reduced, and superheater, the reheater desuperheating water consumption of boiler significantly reduce, and exhaust gas temperature reduces, and improves boiler efficiency.
Although described preferred embodiment of the present utility model, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model schematic diagram comprises these change and modification.
Claims (7)
1. a 300MW generating set boiler staged combustion systems, is characterized in that, comprising: boiler furnace (1); Bellow assemblies (2); Coal gas system (3);
Four limits of described boiler furnace (1) are respectively arranged with every angle burner (4);
Described bellow assemblies (2) and described coal gas system (3) provide air and fuel to burn by the nozzle of described every angle burner (4) to described boiler furnace (1);
Described boiler furnace (1), on longitudinal space, is provided with single-stage combustion district, secondary firing district, three grades of combustion zones;
Described single-stage combustion district is on longitudinal space from top to bottom, the nozzle arranged has: A floor height gas jets (101), GA floor height gas jets (102), B floor height gas jets (103), bottom overfire air jet (104), coal dust A layer nozzle (105), AB coke charge gas jets (106), coal dust B layer nozzle (107), BC coke charge gas jets (108), coal dust C layer nozzle (109), overfire air jet (1010); Wherein, described A floor height gas jets (101), described GA floor height gas jets (102), described B floor height gas jets (103), described coal dust A layer nozzle (105), described AB coke charge gas jets (106), described coal dust B layer nozzle (107), described BC coke charge gas jets (108), described coal dust C layer nozzle (109) is input to the 80%-85% that the fuel burnt the first combustion zone accounts for total fuel quantity altogether, described bottom overfire air jet (104), the excess air coefficient α that described overfire air jet (1010) provides
1>1;
Described secondary firing district is on longitudinal space from top to bottom, the nozzle arranged has: nozzle (1011) under lower burnout degree, lower burnout degree top nozzle (1012), overfire air jet (1013), coal dust D layer nozzle (1014), DE coke charge gas jets (1015); Wherein, described coal dust D layer nozzle (1014), described DE coke charge gas jets (1015) is input to the 15%-20% that the fuel burnt the second combustion zone accounts for total fuel quantity altogether, nozzle (1011) under described lower burnout degree, described lower burnout degree top nozzle (1012), the excess air coefficient α that described overfire air jet (1013) provides
2<1;
Described three grades of combustion zones, on longitudinal space from top to bottom, the nozzle of setting has: coal dust E layer nozzle (1016), top overfire air jet (1017), nozzle (1018) under upper burnout degree, upper burnout degree top nozzle (1019); Wherein, described coal dust E layer nozzle (1016) does not provide fuel; Described top overfire air jet (1017), nozzle (1018) under described upper burnout degree, the excess air coefficient α that described upper burnout degree top nozzle (1019) provides
3>1.
2. 300MW generating set boiler staged combustion systems as claimed in claim 1, is characterized in that,
Described bellow assemblies (2) at least comprises the first bellows; Described first bellows connect every angle burner on the adjacent both sides of described boiler furnace;
Described first bellows become at least one air compartment by baffle for separating, and at least one air compartment described connects the nozzle at every angle burner (4) on the adjacent both sides of described boiler furnace.
3. 300MW generating set boiler staged combustion systems as claimed in claim 2, is characterized in that,
Top plenum corresponding to described first bellows can swing in the interval of [-10 ° ,+10 °] in the horizontal direction.
4. 300MW generating set boiler staged combustion systems as claimed in claim 1, is characterized in that,
Described coal dust A layer nozzle (105), described AB coke charge gas jets (106), described coal dust B layer nozzle (107), described BC coke charge gas jets (108), described coal dust C layer nozzle (109), described coal dust D layer nozzle (1014), described DE coke charge gas jets (1015), described coal dust E layer nozzle (1016) all can swing up and down 20 ° in the vertical;
Described bottom overfire air jet (104), described overfire air jet (1010), described overfire air jet (1013), described top overfire air jet (1017) all can swing up and down 30 ° in the vertical.
5. 300MW generating set boiler staged combustion systems as claimed in claim 1, is characterized in that,
Described coal dust A layer nozzle (105), described coal dust B layer nozzle (107), described coal dust C layer nozzle (109), described coal dust D layer nozzle (1014), is all provided with shutter and waveform bluff body in the spout of described coal dust E layer nozzle (1016);
The coal dust entering nozzle can be shunted by described shutter, the dense phase pulverized coal air-flow of formation and light phase breeze airflow;
Described waveform bluff body can make described dense phase pulverized coal air-flow and described light phase breeze airflow have stable recirculating zone in described waveform bluff body exit, so that dense phase pulverized coal air-flow and the burning of light phase breeze airflow.
6. 300MW generating set boiler staged combustion systems as claimed in claim 1, is characterized in that, the fuel that described single-stage combustion district uses is specially: coal, high gas, burnt gas.
7. 300MW generating set boiler staged combustion systems as claimed in claim 1, is characterized in that, the fuel that described secondary firing district uses is specially: coal, burnt gas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895393A (en) * | 2017-02-22 | 2017-06-27 | 首钢京唐钢铁联合有限责任公司 | A kind of mixed gas fire low nitrogen burning system again |
| CN110081427A (en) * | 2019-05-15 | 2019-08-02 | 哈尔滨锅炉厂有限责任公司 | A kind of high proportion suitable for medium and small unit mixes the low nitrogen coal burner group of burning blast-furnace gas and coke-stove gas |
| CN110686232A (en) * | 2019-08-30 | 2020-01-14 | 无锡华光锅炉股份有限公司 | Inferior high temperature inferior high pressure pulverized coal fired boiler |
-
2015
- 2015-04-08 CN CN201520207585.4U patent/CN204717670U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895393A (en) * | 2017-02-22 | 2017-06-27 | 首钢京唐钢铁联合有限责任公司 | A kind of mixed gas fire low nitrogen burning system again |
| CN110081427A (en) * | 2019-05-15 | 2019-08-02 | 哈尔滨锅炉厂有限责任公司 | A kind of high proportion suitable for medium and small unit mixes the low nitrogen coal burner group of burning blast-furnace gas and coke-stove gas |
| CN110686232A (en) * | 2019-08-30 | 2020-01-14 | 无锡华光锅炉股份有限公司 | Inferior high temperature inferior high pressure pulverized coal fired boiler |
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